He is in the mid to low 30's, right now.
I determine this because there is a Daily tracker of approval by state called Civiqs that calls people up every day to get their opinion on Joe. He is now apparently at -22 net approve, with 56% dissaprove and 34 approve. Similar to what
@Gehenna said earlier, around the low 30's there is a point where he is going to crater hard as his core base gets fully disenfranchised with him, and I believe thats already happening.
His disaproval has started to spike in the last 4 holdout states that give him a positive rating.
I posted this -less than- one month ago.
Maryland is still Approve +2, but the others have crashed.
Massachusetts is now approve +4.
Vermont is approve +3.
Hawaii is approve +8.
Meanwhile he still continues to fall in large blue states.
California at the time was disapprove+3, now it's disapprove+11. Illinois is similar. And he is still slowly moving downward in more red states.
And this was just ONE MONTH AGO.
He is supremely fucked. The trendline isn't going in his favor either. And this is all before the press conference and the VRA being killed gets factored in!