He’s already on his throne is the idea in the heavenly ( spiritual ) realms in the new Jerusalem and many saints are there with him
“ But some man will say, How are the dead raised up? and with what body do they come? ….it is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
…And as we have borne the image of the earthy, we shall also bear the image of the heavenly. Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.”
1 Corinthians 15:34-35, 44-45, 47, 49-50 KJV
“and the graves were opened; and many bodies of the saints which slept arose, and came out of the graves after his resurrection, and went into the holy city, and appeared unto many.”
Matthew 27:52-53 KJV
“And Jesus said unto him, Verily I say unto thee, To day shalt thou be with me in paradise.”
Luke 23:43
“The LORD hath prepared his throne in the heavens; And his kingdom ruleth over all.”
Psalm 103:19 KJV
“Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.”
John 18:36
“And he said unto them, Ye are from beneath; I am from above: ye are of this world; I am not of this world.”
John 8:23 KJV
“He that cometh from above is above all: he that is of the earth is earthly, and speaketh of the earth: he that cometh from heaven is above all. And what he hath seen and heard, that he testifieth; and no man receiveth his testimony. He that hath received his testimony hath set to his seal that God is true. For he whom God hath sent speaketh the words of God: for God giveth not the Spirit by measure unto him.
The Father loveth the Son, and hath given all things into his hand. He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.”
John 3:31-36 KJV
“In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also “
“So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God.”
Mark 16:19 KJV
“If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. For ye are dead, and your life is hid with Christ in God.”
Colossians 3:1-3 KJV
“but the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy conversation and godliness, Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.”
2 Peter 3:7-8, 10-11, 13 KJV
notice the apostles never speak of esrthly Jerusalem being restored or Jesus reigning in it for a thousand years it’s only seen in johns spiritual heavenly vision of apacolypse ? But the doctrine when they tell us what we’re waiting for is Jesus return when we’ll be changed if we’re still alive or raised up if we slept beforehand
See if Jesus is ruling on earth for a thousand years then why this ?
“For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.”
1 Thessalonians 4:16-17 KJV
“Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed, in a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.”
1 Corinthians 15:51-52 KJV
Jesus is in the new Jerusalem the reality of Gods promised land and in the end he will gather his people for the eternal things and destroy this one we see like Peter is explaining in chapter 3 of his second epistle above but we have a promised land that will eventually become the new creation when this one ends it’s already a kingdom with people
Redeemed from earth in heaven thoer spirits alive and well with Jesus
“These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth. …..But now they desire a better country, that is, an heavenly: wherefore God is not ashamed to be called their God: for he hath prepared for them a city.”
Hebrews 11:13, 16 KJV
“but ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels, to the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, and to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.”
Hebrews 12:22-24 KJV
I think ( just my belief ) Jesus kingdom is In Heaven and many are already with him reigning and rejoicing like revelation 12 shows us even while earth is being ran down by Satan and his beast and it’s inhabitants oppressed heaven is celebrated rating the kingdom after they had died on earth but they are rejoicing in heavens kingdom.
i think the ot prophecies we’re to be fulfilled in Jesus generation and the nt will be at his second coming the “ thousand year “ riegn I think is in heavens kingdom