I am sorry for your circumstance, but glad you joined us.
It sounds like you know what you need to do. Waiting for him to respond or leave may take a while. He knows he can sweet talk you and stall for time, and most addicts don't do anything to make plans even when we give them a time line. Perhaps you might want to make it a short line.
You are not alone here, many have been where you are, and I hope you'll stick around and walk with us a while. I think you'll find that our path gets brighter every day we work on helping ourselves.
Welcome to SR.
Hugs