Before Christ was given all authority and power as in had the keys of hell and death, not a single OT saint, the people of faith in the OC, received the promise of God, as in going to be with Him having eternal life in heaven with God the Father.
They just were not allowed to live in heaven, and that includes the thief on the cross, even though he gave a good testimony of faith.
Not Elijah, not Enoch either.
Hebrews 11
39 And all these, having obtained a good testimony through faith, did not receive the promise,
40 God having provided something better for us, that they should not be made perfect apart from us.
The NC is one with better promises.
And the OC made no one perfect.
The NC makes us to have perfected spirits.
Our citizenship in the NC is in Heaven with God.
Until our resurrection we are there with perfected spirits.
NOT a SINGLE OT SAINT was made perfect apart from us of the New Covenant.
They had to wait in the place of the righteous dead, Abraham's Bosom, paradise, etc... to receive the promise of eternal life.
And the result is gloriously better for everyone.
Here is proof of this perfection in our NC, which some people likely would object about,
The Glorious Company
18 For you have not come [
g]to the mountain that may be touched and that burned with fire, and to blackness and [
h]darkness and tempest, 19 and the sound of a trumpet and the voice of words, so that those who heard
it begged that the word should not be spoken to them anymore. 20 (For they could not endure what was commanded: “And if so much as a beast touches the mountain, it shall be stoned [
i]or shot with an arrow.” 21 And so terrifying was the sight
that Moses said, “I am exceedingly afraid and trembling.”)
22 But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, to an innumerable company of angels, 23 to the [
j]general assembly and church of the firstborn
who are registered in heaven, to God the Judge of all,
to the spirits of just men made perfect, 24 to Jesus the Mediator of the new covenant, and to the blood of sprinkling that speaks better things than
that of Abel.