For the benefit of other 4a Pro owners, I have now discovered that unlike the OP advice, this is not generally available update to OS. The OP should have includes the caveat
Firmware rollouts are usually staggered, meaning not all users will receive the update simultaneously. This approach allows us to monitor for any issues and ensure a smooth and stable deployment.
I was trying to figure out why Update kept saying “You already have the latest version”. Guess the rest of us will have to wait for an official update in the near future….