While the OTA update has started rolling out now, it might not have hit your LG manufactured Nexus 5X yet. You can try to coax it out of your phone manually by going to Settings > About Phone > Check for updates.
So Google is killing two birds with one stone for the Nexus 5X. Judging from the comments posted in Reddit, there are quite a few bugs on the device including some related to Wi-Fi connectivity, and others related to the fingerprint scanner. Others have complained about bugs found in the camera. Hopefully the update will fix some of these issues even while it beefs up the security of the phone.
Google Nexus 5X
source: Reddit via AndroidCentral