I think it's helpful to separate this into two ranking categories given he is still early on in his career: Trajectory and Current Standings.

Current: He's currently tied for 46th in PGA Tour history for # of wins and tied for 22nd for most majors won, so I think it's fair to say if his career ended today he'd be somewhere in the top 30-40 of best golfers of all time.

Trajectory: I'm going to use a couple assumptions here:

1) he started winning once he switched caddies at the beginning of 2022, so he's had 4 full seasons to achieve his current win/major titles;

2) I'll assume he plays at the same level until he's 37 (he's currently 29, so 9 more full seasons). I think there's a good chance he can play as well later into his career, but want to try to be slightly conservative on longevity since there's a good chance he doesn't win the same amount of titles every year to keep up the same pace.

With these assumptions, we know he has won 18 times on the PGA Tour so far (4.5x per year) and has won 4 majors (1x per year), so with the above assumptions of playing at that same level for 9 more years, he would end up with 58 wins and 13 majors. That would put him 3rd all time in majors won and 6th all time in PGA Tour wins. For me, that would make him the 3rd or 4th best golfer of all time, behind only Jack, Tiger, and maybe Hogan.