It seems like Huawei has begun the EMUI 10.0 rollout all together because Huawei Mate 20 series users running EMUI 9.1 are now started receiving stable EMUI 10.0 in the European countries.
Huawei Mate 20 and Mate 20 Pro running EMUI 9.1 receiving stable EMUI 10.0 update with version 10.0.0.154 and Huawei Mate 20 X (4G) receiving EMUI version 10.0.0.180. The update is also rolling out for Mate 20 RS Porsche Design
Also, Huawei is pushing the patches with the same versions (mentioned above) for the Beta testers. (only for already existing testers)
How to update:
Most of the users reported that they received this OTA update via HiCare app but below you can try both ways.
Go to Settings > System > Software update > Check for Updates. If an update is available, it’ll ask if you want to download it.
Or open HiCare app > Update > Check for updates.
Tip: We recommend you take back up of your important data to prevent any data loss.
The latest version of EMUI brings new features and changes in user interface including the dark mode, magazine-style UI layout, Morandi UI color system, and more.
Note: This update is rolling out in batches and will expand gradually in different regions and countries.