I'm in the same kind of situation as you. Got two ADRs and then the "Background changed to in progress" update after the second ADR. This update as far as I can tell is a tell that application is sent for comprehensive security check, which I confirmed recently when I got my GCMS notes.
I'm gonna take a wild guess and say we are from the same region, which might be one of the triggers for a comprehensive security check. Military service (likely for your spouse) or any government jobs could also trigger it.
Try and take your mind off the application for now. You can request GCMS notes while you wait, but wait is all we can do right now.