Pulisic didn't make the Guardian 100 list this year. No American did, I believe. Now, if he continues his good form, he'll probably make it next year. But I doubt they'll put him in the top 50. Even if he might deserve it. A super hot second half giving him something like 15/10 would probably force their hand though.
This is probably the best he has played since the short period during the lock down when he was phenomenal.
Of course his good run during the first half of the season also coincides with him having a decent run of health.
He is in his prime years now and this is probably close to the best he will get, top 100, top 75 what ever. Whether he can hold those levels for a few years will very likely come down to whether his body will allow it.
It is interesting that you mentioned the Guardian Top 100. They ranked his AC Milan teammate, and opposite winger, Leao as the 30th best player in the world. And by most accounts, Pulisic has been the better of the two so far this year.