XDA user "joemossjr" has managed to capture the OTA of T-Mobile Moto Z2 Force Android 8.0 Oreo update, meaning that owners of the Moto Z2 Force can install the update right now if they wish to (link to XDA post at the bottom of the page). But before you do, there are a few things to consider-
Joemossjr has stated that this update can only be flashed on Moto Z2 Force T-Mobile with build NCX26.122-59-8 (Download link). Note that this OTA file is for the Moto Z2 Force on T-Mobile, so do not attempt to flash it on other devices.
There's only 1 Soak Test OTA file available for the Moto Z2 Force. The developer states that you need to Install it in order to get the latest Android 8.0 Oreo with December Security patch, new icons, and features.
We recommend you to wait for the official OTA, as Motorola is rolling the update in phases.