First, let me tell you how sorry I am that you are been treated like this. No human being should be subjected to this level of emotional abuse.
You say you don't want to deal with her but you can not leave until tomorrow. Here a few suggestions for you.
You have two options. Call an Uber and have them drive you to the closest hotel so that you can spend the night there or take the rest of the day to separate your stuff from hers. Set a bed for her in one of the kids bedrooms and put all her stuff there.
Either way tell her that after tomorrow, she needs to find a place to stay until the divorce is final.
Call a lawyer and set an appointment some time in the next few days. Give her this number and tell her that from now on she needs to contact you through your lawyer.
Ask her to give you the times she would like to come and visit the kids so that you keep contact with her to a minimum.
When she comes tonight do not engage her, if she wants to talk just let her but do not get in a conversation. Do not get emotional or angry, just let her talk and once she is done. Just tell her you are done with her and walk away.
Focus on making sure the kids feel safe and they realize that mom and dad's problems have nothing to do with them.
These will show her that you are not joking and hopefully shake her out of the affair fog.
Good luck.
Deacon