While many have already been running the official version of Android Nougat for a little while now (namely those who participated actively in the Android developer preview builds), the same cant be said for every Nexus 6P owner. Google held the update back for a little while to work out a few battery optimization issues.
The Nexus 6Ps factory image is now up and ready to download for your flash-all.bat pleasure. The build is listed with the code: NRD90U. Its also worth noting that this build of Android 7.0 Nougat is already fixed up to Septembers security patches, and not Augusts.
Factory Images | OTA Files