HMD updated its webpage where all of the released official Nokia phone updates are listed for easier tracking later on. Now you can check the list of devices that got the latest security patch or new Android Build update. For example, you can see that Nokia 9 Pureview is on the April security patch, and so is Nokia 8.1, but many of its software variants still need to be updated with the latest security patch. Our trusty Nokia 6 (2017) is still on the wait list for the latest security update, but various Nokia phones received it which is a job nicely done.
If you want to browse the software release tracker page, click here.