@Sarge2 This is somewhat a favorite topic and has been discussed in many threads in this discussion area. Locked, or unlocked, the carrier has to approve the firmware before it is available to devices on their network. They want to ensure that rogue software won't take down their network or drive their support team crazy.
So, reach out to AT&T and see if they can help you get the update.
So much for AT&T releasing their updates timely.
Can only when December update will be received perhaps by February 2022.
And yes all 3 phones are unlocked.