The soul of Jesus was preexistent in heaven before God sent it to earth. When God sent His soul to earth His soul came into being at the time of conception and then after His time in the womb of Mary the physical body of Jesus was born of Mary.
An immortal soul does not PUT ON immortality. All physical bodies are mortal and all souls are immortal, not only the soul and body of Jesus.
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There are no physical bodies in heaven so the body of Jesus does not live in heaven. Jesus is in heaven with a spiritual body, not a physical body.
The physical body of Jesus was not resurrected and
changed from a corruptible body into an incorruptible and immortal body because
a physical body cannot be changed into a spiritual body that will never die.
Paul said that there are
two different kinds of bodies:
--- The glory of the heavenly bodies is different from the glory of the earthly bodies.
--- For just as there are natural bodies, there are also spiritual bodies.
Paul says that our physical bodies cannot inherit the Kingdom of God, and the Kingdom of God is in Heaven. When Paul says these dying bodies cannot inherit what will last forever, he is referring to the spiritual world (Heaven), which will last forever. Our physical bodies will die and we will be raised (resurrected) as spiritual bodies that will be suited to go to Heaven and last forever.
1 Corinthians 15:40-54 New Living Translation
40 There are also bodies in the heavens and bodies on the earth. The glory of the heavenly bodies is different from the glory of the earthly bodies.
44 They are buried as natural human bodies, but they will be raised as spiritual bodies. For just as there are natural bodies, there are also spiritual bodies.
50 What I am saying, dear brothers and sisters, is that our physical bodies cannot inherit the Kingdom of God. These dying bodies cannot inherit what will last forever.
51 But let me reveal to you a wonderful secret. We will not all die, but we will all be transformed!
54 Then, when our dying bodies have been transformed into bodies that will never die,[c] this Scripture will be fulfilled: “Death is swallowed up in victory.[d]
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