It depends on if you've played in many USCF rated events already or not. If you haven't, then you'll undoubtedly be in an "unrated" section and play a wider range of opponents with your results determining how your "provisional" rating fluctuates and who you'll be paired against next.
chess.com technically has nothing to do with USCF OTB events (with the exception of USCF rated events like the online USCF rated events on some chess.com events during the pandemic). Playing OTB is a different skill in itself; some people simply "see" the board better with 3D versus 2D.
Even though chess.com rapid is not equal to USCF rated events, it is probably fairly accurate within a few hundred rating points if you take your online games somewhat seriously.
I know there's a bunch of conversion sites out there for chess.com rating to USCF OTB rating, but they all vary wildly in their results so I just thought I'd ask here. I got a tournament this Saturday and I'm currently unrated since this is the first time I'll be playing an OTB USCF game, let alone a tournament. TL;DR what would my USCF rating be for the tournament*** using my rapid chess.com rating as a reference?
***(The time control for the tourney is 55+10, btw. Idk if it matters)