Currently, there are no notifications in the product that your sites were upgraded. You may check it manually in ShortPoint Dashboard > Upgrade page. Here you may check the current version on your sites.
On the right side of the Upgrade page you may also check the release notes in the Change Log section:
You may always visit our Roadmap page and check what the latest ShortPoint SPFx version is.
We may suggest you to subscribe to our ShortPoint Newsletter to be aware of the latest news, including the release updates.