Think a loan where he can get regular first team football will do him a world of good. He's definitely more pace rather than talent, but he does have some talent as well, and a lot of times players like that can just click and really progress. Definitely some bulking up to do though, and refining his game. Greenwood and Gomes look brilliant already from a technique point of view, and you can see clear potential, Chong is a lot more raw but it wouldn't be out of nowhere if he also made the step up.
Purely out of being realistic, if Greenwood and Gomes become actual important United players, Chong isn't going to. 3 attackers from the same youth team making it at once isn't happening.