http://wccftech.com/september-security-patch-oreo-nexus-pixel/

September security patch for Pixel and Nexus devices has finally started to roll out. While other manufcaturers began releasing the update last week, Google has delayed the rollout and didn’t even post OTA and factory images for manual download. Today, the company has released it all.

After releasing the September bulletin last week for other manufacturers, Google has finally released images for manual sideloading and flashing. While many users reported on Monday that, they are getting OTA update, but there was confusion about the update notification that read Android 7.1.2 instead of Android 8.0 Oreo.