Finally, LG rolled Android 8.0 Oreo update for LG G5. The update brings the latest Android 8.0 Oreo along new features and update. Along with this update, you will also get the latest Security Patch and other bug fixes. Now you can download LG G5 Android 8.0 Oreo for the model: Verizon (VS987), AT&T (H820), Sprint (LS992), T-Mobile (H830), US Cellular (US992), Europe (H850), Taiwan (H858) and International variant (H860N). Now you can download and install LG G5 Android 8.0 Oreo Update.
Currently, the update is rolling for LG G5 with variant F700S and brings August 2018 Security patch. This is the second major upgrade for this device. LG won’t upgrade the LG G5 to Android 9.0 Pie. Check out the list of LG Supported device to get the official Android 9.0 Pie.
Before proceeding, let’s understand about the device. LG G5 smartphone was launched in February 2016. The phone features a 5.3 inch IPS Quad HD Display; 2.1 GHz Qualcomm SnapdragonTM 820 Processor; Android v6.0.1 (Marshmallow) OS; Dual Rear Camera 16 MP & 8 MP Wide; and 4 GB RAM.

The update is currently rolling via OTA (Over the air) to users. The rollout is in a phase-wise manner, it may take a couple of days or weeks to receive the update notification on your phone. If you are not patient, then you can upgrade LG G5 to Android 8.0 Oreo manually.
You did not establish when lg 5 receive oreo update.