Currently 'Boost for Lemmy' doesn't show any real-time notification. The minimum check interval can be set to 30 minutes and that's also inconsistent. There should be an option or by default it should show real-time notification. This issue was also present in 'Boost for Reddit'.
You've got issues if you need rapid notifications while using the Fediverse/Lemmy... etc.
Take a chill pill.
I just asked for that as an option. Sometimes some people need timely notification for a particular post so they can set it.