The Check Now button in About Phone seems to be something of a placebo button, as well. In the past I've got around this by going to Settings->Apps->Google Services and clearing the cache and killing the process. That will force an actual check by pressing the Check Now button.
Of course, if your phone isn't scheduled to receive it yet then you'll still come up bupkis, like I have thus far.
I don't think anyone has gotten the OTA update yet. Once someone has, the zip will get posted and then we can all update from that. Or, you can flash the factory image which is out now but you'll lose your data on the phone.
