Morwendara
I am currently using version 2025071900, but the latest version is still not available. The system says that I have the latest version installed. Is this normal?
At the time of writing, 2025071900 is in stable channel and 2025072800 (which was announced here) currently is in beta channel:
https://grapheneos.org/releases#devices
So you're probably in stable channel. You can check this out under Settings > System > System Updates > Release Channel.
Some info about the release process:
Releases are tested by the developers and then published via the alpha channel. Shortly thereafter, the release is published via the beta channel. Finally, after testing by beta channel users, the release is published via the stable channel. In some cases, issues are discovered during beta channel testing and a new release is published via the beta channel to replace the aborted one. In general, downgrading is not possible unless a downgrade update package is created. Therefore, use the stable channel if you cannot tolerate temporary issues while a new release is being created for the beta channel.
Source: https://grapheneos.org/releases#about-the-releases