RCP has now state polls for Harris and they are very similar to Biden
Battlegrounds Trump Harris Spread
Wisconsin 48.0 47.3 Trump +0.7
Pennsylvania 48.2 44.6 Trump +3.6
Michigan 47.0 45.5 Trump +1.5
Arizona 49.7 43.3 Trump +6.4
Georgia 48.5 44.0 Trump +4.5
Trump Harris
Betting Odds 57.1 35.1
of course, these numbers were very stable for Trump/Biden, and we can expect more volatility now as people learn about Harris, and she might get some from convention and VP choice.