Hi! Unfortunately, they don't work in perfect order. There are still some people from March 2021 waiting on a NOA1, yet a few people from June 2021 have received a NOA2 this week. I think they go in order in general, but they also process some cases at random. That's great for the people who get chosen but it's sad for people who have to wait so long. I wish they had a better way to do this!
Anyway, I'm happy to see some June filers get approved, and I'm optimistic that they'll start moving faster for everyone soon. I do think it makes sense that we're seeing some movement since June 2021 filers are entering 11 months, and the timeline is still 10-13 months.