I think progress is going really well. The main hurdle we're working through right now is around privacy, and making sure that folks don't feel like they have to leak the fact that they're using assistive technology just to get an improved web experience. Alice, Dominic, and James are doing amazing work in this space (see discussion: https://github.com/WICG/aom/issues/81).
Probably the best way to help it progress is to read through the spec/explainer, and bring up any issues you see. In particular, use cases where AOM seems like it would work but maybe doesn't—that stuff is super useful.