I think it depends on what app you’re using. I’m using Damus on an iPhone. I’ll get a general notification in the bottom right corner. When I tap on that I can check “Mentions” in the top right corner of my notification tab. I know you’re on a different platform, but maybe this clue will get you going in the right direction. 
Discussion
Yeah not seeing an option for this in Amathyst. So basically, i dont know if ppl tag me and still havent figured out how to zap through the app.
I now remember that a year ago, I was logging into snort to zap people.
There must me a mlre graceful way.