Sophos Firewall firmware release follows a process as outlined below to ensure the best upgrade experience for as many devices as possible.
If you don’t see a recently announced firmware release in your management console, the below should explain the process and when you might expect to see it. You can always download and manually apply an update from MySophos any time following a new firmware release announcement.
Good Article for Firmware Release process and timeline understanding.
Thanks for information.
Good, this has been a point of confusion for a while, so glad to read the official process!