The areas in Penns and Georgia still to be counted are those from the urban areas (Atlanta, Philly), which are almost all majorly Democratic. All of the states Trump is currently ahead in, bar Alaska, Biden's catching him up fast in due to the mail-in ballots. That doesn't mean he'll definitely overtake in those places, but the numbers as they are adding up seem to be swinging Biden's way.
North Carolina has not changed at all for about 15 hours - no idea what's happening there.
Alaska is almost pointless atm, it's a lock for the Reps regardless.
Arizona is weird because some places have called it, and some haven't. It's getting close there, but people seem to be sure Biden's won there, but it doesn't look clear cut right now.
I could still be seeing it wrong, but I just zoomed in on Pennsylvania, North Carolina and Georgia, and the areas yet to declare still have a reasonable count for Trump in many areas, and assuming the percentage that have voted is accurate, it looks like a long shot to think Biden's going to pull back enough in those areas.
Edit. Just looked at Nevada, and area wise, it's Trump, but it's very different in the more populated Counties. It looks to me like the future lies in Reno and Las Vegas.