Although you didn't explicitly ask, maybe you'll find these information also helpful regarding the last updates:
question:
here i can see that version 2025030300 is the alpha, beta and stable version for like all supported devices. when do the newer versions relase? or is there an error on the relases page
answer by @GrapheneOS :
There's no error there but rather Alpha and Beta were rolled back to 2025030300 prior to releasing 2025030800 because we don't have room on the update servers for 3 releases until we move to larger servers. We have to remove a release that's not going to be reaching Stable before we starting pushing out a new Alpha. It's very annoying and we'll be upgrading the servers soon.
source: https://discuss.grapheneos.org/d/20632-grapheneos-version-2025030800-released/2