They’re doing updates at night, and remember we’re two hours earlier than EST. I heard today they still had over 600K votes to count. Yesterday I heard they were hoping to be done by Friday night, but I don’t see any chance of that happening. Also, these vote counts that you are seeing now are from the mail-in ballots, which generally favor Democrats. The AZ counting rules apparently stipulate that mail-in ballots are counted first, then the in-person votes (which usually skew Republican) will be added last.
Other things: Maricopa County is the largest county in the nation by land mass and apparently now the second largest county in the nation by population. Before about 12 years ago, AZ always voted hugely Republican dating all the way back to the days of Barry Goldwater, so they were able to call elections quickly. Thanks to immigration and a crap-ton of relocated people from CA, IL, MN, etc, this state is now very purple, and the votes are close.