August 9th

NY Post: "Bill Maher says Biden is ‘toast’, predicts date he will drop out of presidential race: ‘Walls will keep crumbling’" 

IIRC the reason why Biden needs to drop out now is that there are filing deadlines for each individual state and the switcheroo needs to get going.

Extra - High-school graduate Chuck Todd: "Chuck Todd stresses extreme urgency if Dems to jettison Joe: ‘They’ve got to do it this weekend’."