There was a notification feed tab to filter notifications to “verified only” (which ironically has lost almost all use as spam and low quality accounts make up the majority of blue checks now), but there was never a way to filter your feed to “Verified Only” — though Elon recently tweeted he plans to create such a ‘feature’, and forcefully roll it out to everyone’s “For You” feed so even unverified users will only see verified tweets in that feed.