Today's the day, Galaxy Nexus owners - Verizon just updated its support documents to reflect the long-awaited Jelly Bean update. From what we're hearing, the OTA is already rolling out, so you should be able to pull it down right now. You'll just need to jump on Wi-Fi and head into Settings > About phone > System update.
The 146.6MB update brings full, stock Android 4.1 build JRO03O. Better late than never - go get it!