https://www.cnet.com/news/microsoft-has-started-to-roll-out-its-windows-10-october-2018-update-report-says/

Users will get a notification when the update is downloaded on their device and ready to be installed. They can choose a time to finish the installation and reboot. 

New features for the Windows 10 October 2018 Update include dark mode for Microsoft apps, text size adjustment and the ability to sync your clipboard across your other Windows devices.