Hi, @Maxwolters 
Thanks for reaching out. I ran into the same challenge and didn’t find any additional public documentation on expected transition or downtime, or the lack thereof.
The fastest way to get this information is likely to reach out to the Success Manager who is assisting with this migration. I can DM you their email address if needed. I’ll also request internally that we update the documentation, where possible, with the details you are asking about.
Best,
Jaycee