The most XO thing that Una has done throughout the entire series run is question junior officers about Enterprise Bingo.
Seriously though as a former sailor I can verify that an XO's job is tedious and boring. It's all paperwork, inspections, and disciplinary crap outside of Captain's Mast (yet an XO does most the work for that before a CO sees anything). The bulk of Una storytelling that we've seen is pretty great. Ortega is the one who needs to shine at this point. She hasn't had much story development.