F-Secure updated their website on Friday 12 October re browsing protection is not yet supported in the Safari 12 browser. And saying "We have started the automatic updates (for F-Secure SAFE 17.4 for Mac)." So I'd expect the follow on update for SuperSafe Boost to happen fairly soon as SuperSafe is based on F-Secure SAFE.
SuperSafe updates do take place automatically.
In the meantime, F-Secure say "we recommend that you use one of the alternative browsers (Google Chrome or Mozilla Firefox) to have access to their browsing protection features".
I have been experiencing the dreaded beachballing when browsing and suspect it has something to do with browsing protection which seems to use a lot of cpu time.
I have temporarily uninstalled the F-Secure product to see if it makes a difference.