I know for ASDOH they are only showing a morning interview session open on 3/20 (the only other March slot is tomorrow), so my guess is that's they're pretty much done with their interviews. Though they may still be inviting for last minute openings in the interview schedule. That 3/20 slot has been open for a awhile which tells me they must be getting finished. According to their website they interview thru March. Sorry if that's not what you wanted to hear.
I don't know about Nova but I know I finally got a rejection (no interview) this week and my app went in September...