Why does Jesus’s Glorified Body have the marks of the wounds?
Jesus’ marks show that he really did suffer and die on a Cross. He is always before the Father in heaven as the Lamb who was slain. His Sacrifice was once and for all, but is an eternal Sacrifice, being eternally presented before the Father. His marks also serve as a reminder of his sacrifice for us.
Why is it important to note that not a bone was broken? Is it to emphasize that it was forseen and prophesized (OT)?
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Yes. In the OT it was believed that God would protect the Messiah from broken bones. But, also, in the OT when they used to do animal sacrifices, the lamb had to be free of all blemishes in order to be acceptable to God. Jesus not having any broken bones could be seen as a sign that he is without spot or blemish and is thus an acceptable sacrifice.
"These things happened so that the scripture would be fulfilled: “Not one of his bones will be broken,” (John 19:36)
“Not a bone: A reference to Ex 12:46. ● This restriction was part of Israel’s Passover legislation that disqualified lambs with blemishes and broken bones from being slaughtered and eaten for the liturgical celebration (Ex 12:5; Num 9:11–12). Jesus, whose bones are left intact, is the unblemished Lamb (Jn 1:29) fit to be consumed in the eucharistic liturgy (6:53–58; CCC 608).” - ICSB commentary
Why was Thomas convinced onces he saw the wounds? Why would Thomas expect Jesus to have the marks of the wounds after resurrection?
Thomas said that unless he puts his finger in the holes he would not believe. And, that is exactly what happened. And, thus he believed. Jesus responds by saying blessed are those who have not seen yet believe. Thomas has no reason to think that Jesus would not have those wounds after being resurrected. In fact, Thomas has no concept of a resurrected body, only that Jesus was dead and is now alive. Seeing the holes would confirm to him that this really is him and act as identifying marks.
“Thomas’ doubting moves our Lord to give him special proof that his risen body is quite real. By so doing he bolsters the faith of those who would later on find faith in him. “Surely you do not think”, St Gregory the Great comments, “that it was a pure accident that that chosen disciple was missing; who on his return was told about the appearance and on hearing about it doubted; doubting, so that he might touch and believe by touching? It was not an accident; God arranged that it should happen. His clemency acted in this wonderful way so that through the doubting disciple touching the wounds in his Master’s body, our own wounds of incredulity might be healed. …] And so the disciple, doubting and touching, was changed into a witness of the truth and of the resurrection” (In Evangelia homiliae, 26, 7).” - Navarre Commentary
Will those that make it to heaven have the marks of wounds and broken bones in their glorified bodies that they got when on earth?
No. These marks on Jesus are unique. As I said before they signify his Sacrifice on the Cross for us.