I will do the best I can to explain this series of events. Okay, let me put this on a timeline. Hypothetically, let's say the church is raptured next year on Passover, that would be April 24, 2024. After the rapture occurs, several events will take place. The two witnesses will be revealed. Then the antichrist will be revealed. Thirdly, the 144,000 will receive the mark of the Father on their foreheads, the world will know who they are.
I believe your question concerns the time the two witnesses will finish confirming Christ's new covenant, the one Daniel 9:27 speaks of. After the 3 1/2 years, the two witnesses are killed and taken into heaven. The 3 1/2 years they witnessed will close out Daniel's prophesy of 490 years. Also, at that time, the antichrist will suffer a deadly wound. It's now his high priest, the second beast comes into view. He will heal the deadly wound of the antichrist, do great wonders, build an image of the antichrist, and will cause everyone to receive the mark 666. Those who refuse will be put to death. This period is called the Great Tribulation. It will last for 3 1/2 years; it has nothing to do with the 490-year prophesy. When the 3 1/2 years are over, that's when the Lord returns and takes vengeance on his enemies. That date would be, April 2031, exactly 2000 years from the time of his ascension in April of 31 A.D.
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