5.0 update not received
You could just wait it out, as you will eventually be prompted, or you have a couple of options.

You could try and speed up the update by trying to trigger it again, try wiping google play services data (it worked on my nexus 4).

Or you could flash the system image

A better option however would be to just flash the ota file, which can be done without unlocking your bootloader.

Get the ota, and follow the instructions at this link:

http://www.androidpolice.com/2014/12/23/flash-all-the-things-lollipop-ota-update-zip-file-roundup/