Can your spouse be there for pick ups the next 2 days? What about a neighbor? Generally these bullies like to target one person as they feel they have the power...adding another person can mute the situation.

I don't know that you can terminate without notice since it isn't in your contract and I would worry that would just anger him and make the situation worse. As much as I would not want this man anywhere near me and the daycare you might not have the choice I think your best bet is to not allow him entry (have child ready and send him out the door, close and lock the door. Bring in additional adults. Anyone you can just to be viewed and present and to be witnesses to anything said/done. If you can't be inside with another adult present can you be outside in the front yard where there is more of a chance others are around?

I hope it goes smoothly for you :-(