After being released in various other markets, the Android Oreo update for the US variant of the Huawei Mate 9 is now rolling out. Both the MHA-L29 and MHA-L09 are getting the update and it should be coming to your Mate 9 over the course of the next few days. The 29 is the dual SIM variant while the 09 is the single SIM.
Along with the update to Android Oreo itself, you will be getting the January Android Security Update patch, a new portrait mode for the rear camera, and the new AI-driving EMUI 8 user experience.
EMUI 8 is a substantial step forward for Huawei, bringing a much deeper AI integration but an overall improved flow and usability to their UI. One of the biggest complaints by users of previous EMUI builds were the navigation and general user friendliness of the UI. Version 8 improves that significantly.
The Huawei Mate 9, especially now that Oreo has arrived, is still one of the better values for a Phablet phone. Right now you can pick up the dual SIM variant for $482 on Amazon. I reviewed the phone last summer and it remains one of my favorite phones of 2017.
If you have the Mate 9, look for the update to come to your device over the course of the next few days. It is a big update at just over 1.2GB so you will want to download it on WiFi.