Despite the fact that Motorola devices are running stock Android and the Moto Z4 was launched back in June 2019, the long-awaited Android 10 update is arriving just now. Well better late than never, and according to some Moto Z4 owners, the company has finally started rolling out the update. Perhaps, it's a staged rollout since it has been reported by only a handful of users so it might take a couple of days to reach all the owners. Rhe build number is QPF30.130-15-7M and the update should bring all the new features Android 10 offers such as system-wide dark mode (that was an issue...
Source: https://www.gsmarena.com/motorola_starts_seeding_android_10_to_moto_z4_owners-news-41952.php