The saved will change in a blink of an eye.
… the dead will be raised imperishable, and we will be changed (1 Cor 15:52)
1 Cor 15:50 And I say this, brothers, that flesh and blood is not able to inherit the kingdom of God, nor does corruption inherit incorruption.
51 Behold, I speak a mystery to you: we shall not all fall asleep, but we shall all be changed.
52 in a moment, in the blinking of an eye, at the sound of the last trumpet. Indeed, that trumpet will sound, and then the dead will be raised never to decay, and we will be changed.
53 For this corruptible must put on incorruption, and this mortal must put on immortality.
54 But when this corruptible shall put on incorruption, and this mortal shall put on immortality, then will take place the word that has been written, “Death was swallowed up in victory.
–Death is swallowed up concerning the saints of the first resurrection. Death has been won; those resurrected can no longer die because they have received eternal life (immortality). The second death does not have any power over them.
Read more about the (first) resurrection. See the table of contents.