Yes, Biden is President, and there will be 2 runoffs for all the marbles. PA is also only a matter of time.
In any other year, they likely would have called it for Biden. Since FOX and AP already have called AZ, any non-Nevada state called means Biden wins. But no one seems to want to be first, because it means incurring the Trump rage.
Basically, come back on 12th of Nov for NC. Alaska also has a similar delay before we get mail-ins (though it is much more Pro-Trump) Until then, we just have celebrating predicted milestones and various hot takes. And Trump raging out.
Anyway, in the event that Democrats do take a 50-50 Senate, there is a viable governing. It will be tight as hell, and on the knife-edge, with Republicans trying every vote to split someone off. But I think Democrats could on party lines, get
HR1, a $15 minimum wage, and a decent but not great stimulus. Maybe legal weed nationwide. That would be enough victories to use to campaign on for 2022.
Biden could starting now, try and get a few safe blue, conservative/institutionalists out of the Senate. Like Feinstein. Manchin is enough trouble, no need to add issues from a safe area.
If they miss them, however, the Senate is just going to suck, and Biden is going to spend most of his first year just fighting to get most cabinet positions in place, and come to 2022 with little more than 'I kept the lights on'.