He caught 3 balls with his hands today. It was nice to see that. You can tell that it isn't natural for him and that he has gotten into the habit of using his body. And he does jump when he doesn't have to.
The mental mistakes are to be expected. He was basically a blocker in college who ran an occasional 9 route. He seems like a bright kid and a hard worker so I am sure that it is only a matter of time before he understand the offense and learns to make sight adjustments based on the defense.