Just ran a manual check for updates on one of my test virtual machines (the one that recently got the still active free Windows 7 - 10 update) just out of interest.
I'm an advocate of not doing in-place updates for the most part but for anyone who is interested, it downloaded and installed the bulk of the update from within Windows Update.
I didn't watch it end-to-end but I believe it did one reboot then continued as though doing any other regular update.
Some of the new features are listed here:
https://docs.microsoft.com/en-us/windows/whats-new/whats-new-windows-10-version-1809
I'm an advocate of not doing in-place updates for the most part but for anyone who is interested, it downloaded and installed the bulk of the update from within Windows Update.
I didn't watch it end-to-end but I believe it did one reboot then continued as though doing any other regular update.
Some of the new features are listed here:
https://docs.microsoft.com/en-us/windows/whats-new/whats-new-windows-10-version-1809