I'm also doing AOS through my USC spouse, sent my stuff late February and am currently waiting on the interview to get scheduled. I think wait times depend on where you live and the volume of applicants from that area.
However, these COVID times have complicated things. USCIS is dealing with serious financial troubles and was on the brink of furloughing more than half its workers. In order to avert furloughs for now, they are apparently cutting costs everywhere they can, meaning that there will be longer processing times for everything.
So safe to say if you already live in a place with long wait times, it will be a miracle if you are able to get your green card within a year of applying. I live in the Bay Area in California, so I'm already resigned to the fact that I probably won't get an interview/green card until next year.