HMD Global has rolled the Google's January security update for the Nokia 6 (TA-1000) and Nokia 7 (TA-1041) in China. The update is 112MB in size for Nokia 6 and just 70MB in size for Nokia 7. You can manually check for the update by going to Settings > About phone > System Update.
As you can see in the screenshots below the update for both the devices just brings the Google's January security patch. You can find more about Google's December Security update at Android Security Bulletin.
|January Security update for Nokia 7 (TA-1041)|
|January Security update for Nokia 6 (TA-1000)|