Normally getting an RFE for medicals means that they've waived your interview, so ideally - an approval. Normally if they want to interview you, they'll send you a courtesy notice to get the medical done, and then the interview notice will state to bring it with you to the interview.
That's not always the case, I've had an RFE for medicals and then got interviewed as well. However I've had a messy immigration history (EWI, removal proceedings, marriage, I-130, reopened proceedings, admin closed proceedings, I-360, recalendar/terminate proceedings, I-485), I believe that with AOS after an EWI they have to interview you as a matter of policy though that rarely comes up since there's few ways you can AOS after an EWI (essentially just VAWA, SIJ, 245(i), and some really rare special categories).
How long, depends on the field office and just plain luck.
Should you be worried about an I-360 interview? No. We aren't exactly sure what the interviews on that will look like exactly, I personally believe they will use those more to question questionable marriages since in general they don't question the abuse parts unless you write complete nonsense.
Finally the biggest part of it all is that's for cases where the I-360 is currently pending. Everyone right now who has an I-485 with the field office had the I-360 already approved at VSC, so the new rules aren't applicable in your case anyways.