As with any OTA, it will go out in phases. So if you don’t see it right away don’t freak out. It will be hitting your device soon. You can always head into the menu > settings > About Device and see if you can prompt for the update manually. No promises that will work out though.
If you already picked up the update, let us know what your think. For those still waiting, be patient. You are much closer to Jelly Bean goodness then you were 2 weeks ago. Unless you were rooted and ROM’d of course.
Be on the look out for your update and make sure you are over 50% charged and have a strong Wi-Fi connection available. Feel free to take a gander at some more specific information provided by Verizon at their Samsung Galaxy S III support page.