There is little question that June 2 will be a watershed moment in Huawei’s quest for software independence. Huawei is set to make its proprietary HarmonyOS smartphone operating system official as a credible alternative to Android.
Huawei Devices Which Will Get Harmony OS Before 2nd June Launch Event

A list of Huawei devices that will be transitioning to the platform has been made public. The Mate 40 series (Mate 40, Mate 40 Pro, Mate 40 Pro+, Mate 40 RS), Mate X2, and MatePad Pro are among the devices in the leaked list.
More gadgets are likely to join the bandwagon, and this is likely to happen quickly. On June 2, Huawei, on the other hand, will publicly reveal the devices that will be among the first to switch to the new platform.
By the end of the year, the business wants to have more than a quarter of a billion devices running HarmonyOS. The majority of the devices that will eventually use the Android alternative will be existing devices that migrate to the new platform, with only a small percentage coming from new devices.
The US government’s lengthy and rigorous restrictions on Huawei have resulted in the development of Huawei’s HarmonyOS. As Washington tightened the noose on Huawei’s smartphone business, the company gasped for air.
In the short term, the emergence of an alternative platform to Google’s Android has substantial implications. It might mark the beginning of a period of more independence and less reliance on US vendors for essential software components.

Because so little is known about the HarmonyOS platform, Huawei has been managed to keep it hidden from prying eyes thus far. However, in terms of user interface and design functionality, it may not be considerably different from Android 11.