I watched a lot of his footages as in clips with all his touches in many games. I can see why Ten Hag wanted him but he's currently very raw and folks with wildly high expectations would have to tamper them not to be disappointed.
He has all the attributes Ten Hag wants specifically and flash potential of being great. He's big, can back his defender, presses like a mad man and runs into the channels. However right now he's still very raw, his touch is very inconsistent which means he doesn't yet maximize his strength when he's receiving the ball with a defender on his back. It lead to loose touches at times.
His final ball isn't quite there yet. You can see he gets in good situations but doesn't quite have the final ball in him. But watching him I totally understand why Ten Hag wants him given the profile of player he's been looking for striker since he's been here at United. Kid has got that Wout work rate and he potentially can be great in his hold up play if his touch becomes less inconsistent.
Folks will have to be patient with him during this season. I can already imagine how and what will frustrate people with him after extensively watching his clips(not highlight but clips covering all his in game touches and movements). But the profile of player he is and the flash of potential he's shown are too great and understandably Ten Hag wouldn't pass on them. But he's quite raw so I'd advice patience and adjusted expectations for this season.
Also seeing the type of defense played on him, I see no problem with him adapting to the PL. He get roughed quite often with defenders stuck to him when he receives the ball. He can handle any physicality from what I've watched.