You don't have to do anything you aren't comfortable with anymore.
Knowing your Ex, I could see him making this arrangement simply to rattle you.
YOU are the mom. If YOU are uncomfortable with this arrangement, have HIM make a different plan to ACCOMMODATE YOU. Tell, simply, I'm sorry but NO. Let me know when you will be picking the girls up and I will have them ready.
HE is the one, after all, that moved so damn far away.
Much love,
Heather
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson