The update brings January patch, it fixes six critical Android vulnerabilities and 13 exploits in Samsung’s software, along with various other minor exploits.
The update size is 707 MB. You can just wait for it to pop up as a notification in the coming days, although that can take a while. How soon the Note 8 update will make its way to other regions remains to be seen.
If you have a Galaxy Note 8, you can download the update manually, just go in the Settings » Software update menu.