If Philippians 3:21 says that the Lord Jesus Christ “...shall change our vile body, that it may be fashioned like unto His glorious body...”, it would only make sense to search scripture to find out just WHEN Christ’s body was glorified, so that we can know what kind of change our own natural body will go through when it is resurrected.
We are told exactly when Christ’s body was glorified, by comparing two verses: John 7:39 and John 20:22.
On the last day of the feast, Jesus spoke to the people about the Spirit, comparing it to “living water” which would flow from the believers. “But this spake he of the Spirit, which they that believe on Him should receive: for the Holy Ghost was not yet given; because that JESUS WAS NOT YET GLORIFIED.”
Clearly, the timing of JESUS BEING GLORIFIED was going to PRECEDE when the believers would receive the Holy Spirit. And we have it recorded when they did receive the Spirit in John 20:22. It was on the first day of the week, the evening after Jesus had first ascended to the Father that morning to be ordained as our high priest in heaven.
Jesus met with the disciples that evening and showed them His hands, feet and side in a body He said was of flesh and bones that they could handle and touch. “Then said Jesus unto them again, Peace be unto you: as my Father hath sent me, even so send I you. And when He had said this, He breathed on them, and saith unto them, RECEIVE YE THE HOLY GHOST:”
Clearly, then, according to John 7:39, this receiving of the Holy Ghost by the disciples at this time MUST have followed when Jesus had already been glorified. At this point, we can say that this glorified body of Christ presented to the disciples that evening is what our vile bodies are going to be changed into. We will be “fashioned like unto His glorious body”, in every detail which was on display for the disciples inspection back then on that first day of the week.
This “glorified body” IS the type of “spiritual body” which we will have as our incorruptible resurrected forms.
Even on the road to Emmaus on that same first day of the week, Christ proved that He was then presently in His glorified body when He told those two travelers. “ O fools and slow of heart to believe all that the prophets have spoken: Ought not Christ to have suffered these things, and TO ENTER HIS GLORY?” Here, Jesus was speaking of His crucifixion and glorification as PAST ACCOMPLISHED EVENTS at that point.
I Peter 1:21 says the same thing. “Who by Him do believe in God, that raised Him up from the dead and GAVE HIM GLORY; that your faith and hope might be in God.” Jesus’s resurrection and the glorification of that body in the tomb were linked together in time as simultaneous events.