You should get a text message from Verizon. If not, you will see this site explode from an overload of happiness and content if the number is higher then .109 and extreme anger and frustration if below that.
Either way, keep watching Crackberry and you'll probably know before Verizon does.
if its an official verizon ota. how would you back up all of your stuff ota ? what is the process on official release?
It basically is installing the new OS over the existing OS and does not need a back up, but you should be making backups on a regular basis. Make a back up of your phone and third party apps before doing the OTA.