Oh my goodness. I mean I'll believe it when the green card is in my hand, but... phew. Thank you both, now I can wait for further updates from USCIS without getting too stressed!
Of course instead I have a fun NEW thing to stress about, namely that even though I reported my change of address to them last year I'm pretty certain their files never got updated... so I was counting on making them update my address at the interview. But that one at least I might be able to fix with a phone call.