In Addition, The update also includes system stability improvements and UI enhancements. As is usually the case with OTA roll outs, it might take time for the update notification to pop up on your device’s screen.
But you can also check it manually by Navigating to Settings => About Phone => System Update. It will Refresh and If the update is available it will automatically Pop-up on your device.
NOTE: If your device is rooted please un-root before performing this update to avoid Bricking of your device and Also Make Sure your Battery Level is About 60% and above.