While Huawei hasn’t had much luck breaking into the US with AT&T and Verizon, they do still have phones that work on American networks. The Huawei Mate 9 is one such phone and it’s currently getting an update in the US. Unlocked models for GSM networks are receiving Android Oreo as we speak.
We don’t have an official changelog for this update, but we do know it’s for Android 8.0 Oreo. The update also brings EMUi up to version 8.0. You can expect to get all of the usual Oreo goodies with Huawei’s unique spin. The OTA is rolling out right now, but it might not be available for everyone right away. Keep checking for the update and it should arrive soon.