While this case is set to be backmerged, it hasn't been at this time. It has been released into 11.29.0.11 at this point. You can see the changelog for cases integrated into cPanel at Change Logs and you can determine your existing version by running the following command:
You can see the most current versions for each tier at the following:
Downloads - cPanel Inc.
Code:
cat /usr/local/cpanel/version
Downloads - cPanel Inc.