Albert Barnes on John 20:20

He showed unto them his hands, &c. In this manner he gave them indubitable proofs of his identity. He showed them that he was the same Being who had suffered; that he had truly risen from the dead, and had come forth with the same body. That body had not yet put on its glorified form. It was necessary first to establish the proof of his resurrection, and that could be done only by his appearing as he was when he died.

(v) "Then were his disciples" Jn 16:22