Good luck with everything tomorrow.
I was in a similar situation to you in 2022: low PSA, Gleason 7 (3+4), four positive cores, and 20% pattern four. At 47 I was a bit older, though still young in prostatectomy terms. Like you, age was a big factor in my choosing RP.
In your first post you say that you are resigned to your sex life being over, but I just wanted to say that definitely does not have to be the case. It will likely take some adaptation but I don't think it's true that no women will now be interested. There are all sorts of people looking for, prioritising and valuing different things in a partner.
Anyway, for now the main thing will be to rest, recover and get back on your feet. Hope it goes really well.