Hey Tim,
That’s great news! I think you need another 0 at the end. 
This number is probably much lower than it should be. I was reading earlier articles on this. The issue was many ClassicPress sites were being registered as WP 4.9 instead of CP. I know this is a really complex issue, and there are a lot of details and moving parts. I suspect there are a LOT more sites running on CP than actually registered.
If you have a few more thousand sites on-board (which probably are), then you have a much bigger reason for the big plugin and theme developers to on-board.
Regardless, I have already taken CP and Classic Commerce for a spin. I am very impressed with the speed and lack of bloat.
Happy New Year!
Cheers
Avrom