For the GTR 3 Pro, GTR 3, and GTS 3, Amazfit is now sending out the second major update. As of this writing, they're receiving the most recent software updates.
For the GTR 3 Pro, a new build with the version number 22.214.171.124 is now rolling out, which includes a GoPro mini app in the Zepp app store, a background app status indicator on watch faces, a screen lock feature in the control center, manual altitude calibration, as well as the usual system stability improvements and bug fixes.
Updated firmware for the Amazfit GTS 3 has been released with the same changelog. While the GTR 3's new software version has yet to be released, it is expected to include the same features as the GTR 3. The GTR 3 Pro's app store is the only unique feature, therefore new apps don't apply to the GTS 3 or GTR 3.