As with all OTA updates, they are rolling it out in stages. As long as there are no major issues to deal with, then it should hit all devices over the next couple of weeks. If you see the notification pop up, make sure you are on a good WiFi connection so you don’t eat up precious data and that your battery is charged up. You can always attempt to prompt the system by heading into the devices settings and checking for updates. It sometimes works and sometimes doesn’t. Good luck and happy updating everyone and be sure to check out the source below for the full PDF detailing new features that you will be gaining.