Trying to see what I can find out. Looks like it was first released last May:
But I am reading that some people didn’t receive it at that time.
I am showing the newest release for beta testing was in March
If you followed the previous instructions and got the Beta app installed and then enrolled the Robot Vacuum to receive Beta Firmware, I am not sure why you are not receiving another update at this time. I can only guess that either it takes a little while for the system to acknowledge and approve access to the beta firmware, or else they have currently paused that beta update track for now. They have done this a few times based on testing and feedback.