Here is an update I found for Celebrity's installation:
"Celebrity Cruises has already provided an update on when it plans to implement the new systems on its ships. Celebrity’s newest ship, Celebrity Beyond, will receive the new system on September 5, among one of the first ships to be turned over this Holiday Weekend.
All of the Celebrity Edge Series ships will have been updated by the end of this year. The installation will then continue into 2023 and be complete by May."
https://www.cruisehive.com/royal-caribbean-unveils-plan-to-rollout-starlink-fleetwide/80203