Is there a specific timing when a release will roll out to your instance once it goes into Production?

The group admin changes are a significant change for our instance and we've prepared to make necessary role changes once the release reaches our instance. (Release beginning 11/09).

Is there a specific timing to this - as in, Cluster 1 goes first, or EST goes first.....it hasn't hit our instance yet and I'm trying to gauge when I'll need to set aside the time to make the changes. If it helps, we're Cluster 2.