If you say I will do somethig it is not necessarily in the far or distand future,. In the quote you posted Peter is put the condition on the action of the following verb in the sentence and it may be understood he is sstressing he will do his best to get all accomplished..........it does not mean after he goes to sleep, it means before. It does not need any specification, it is understood, especially since we know his and our Lord and Savior is the Firstborn of the dead.......Natuallay all who die inthe flesh will follow come the resurrection, including Peter and the other Apostles..
2 Peter 1:
12So I will always remind you of these things,
even though you know them and are firmly established in the truth you now have.
13I think it is right to refresh your memory as long as I live in the tent of this body,
14 because I know that I will soon put it aside, as our Lord Jesus Christ has made clear to me.
15And I will make every effort to see that after my departure you will always be able to remember these things.
16For we did not follow cleverly devised stories when we told you about the coming of our Lord Jesus Christ in power, but we were eyewitnesses of his majesty.
17He received honor and glory from God the Father when the voice came to him from the Majestic Glory, saying, “This is my Son, whom I love; with him I am well pleased.”
b 18We ourselves heard this voice that came from heaven when we were with him on the sacred mountain.
19We also have the prophetic message as something completely reliable, and you will do well to pay attention to it, as to a light shining in a dark place, until the day dawns and the morning star rises in your hearts.
20Above all, you must understand that no prophecy of Scripture came about by the prophet’s own interpretation of things.
21For prophecy never had its origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.
Main points of interest
1. The people that Peter was reminding were already established in truth in all that Peter was talking about yet he still thought it was good to keep reminding them as if it was a duty. Duty doesn't stop, if it stops then no one can promise the same outcome- but Peter here is confidently promising the same outcome even after his departure (death).
2. Peter compares the promise by Jesus and its fruition as something true that they witnessed first hand. He compares his teachings to Jesus's promises and assures them that they will materialize in them (even if not physically like Jesus) but it will dawn in them.
Paul also said the same thing here:
2 Cor 4:
5For what we preach is not ourselves, but Jesus Christ as Lord, and ourselves as your servants for Jesus’ sake.
6For God, who said, “Let light shine out of darkness,”
a made his light shine
in our hearts to give us the light of the knowledge of God’s glory displayed in the face of Christ.
7But we have this treasure in jars of clay to show that this all-surpassing power is from God and not from us.
8We are hard pressed on every side, but not crushed; perplexed, but not in despair;
9persecuted, but not abandoned; struck down, but not destroyed.
10We always carry around in our body the death of Jesus, so that the life of Jesus may also be revealed in our body.
11For we who are alive are always being given over to death for Jesus’ sake, so that his life may also be revealed in our mortal body. 12So then, death is at work in us, but life is at work in you.
13It is written: “I believed; therefore I have spoken.”b Since we have that same spirit ofc faith, we also believe and therefore speak, 14because we know that the one who raised the Lord Jesus from the dead will also raise us with Jesus and present us with you to himself. 15All this is for your benefit, so that the grace that is reaching more and more people may cause thanksgiving to overflow to the glory of God.
In summary, Paul is saying Jesus believed and spoke to them (Paul and the Apostles) and they also believed and spoke to their listeners and it is for their listeners benefit that they die because the words they have spoken will dawn in the listeners hearts as the rising sun. He says to them (Apostles) their work is death but it is life to their listeners. IOW, Paul is saying they will live in their listeners.