First Observation Advice?

Hello! This is my senior year as an Elementary Education major. I have taught many lessons in the classroom since the Fall semester. I have taken over math for my cooperating teacher. I teach out of the curriculum book for the most part with some bits of my own reworking thrown into the lesson. I always try to incorporate a math warm up at the beginning of the lesson before we get into the book. On Fridays I always try to include a math activity/game to keep my students involved while celebrating Friday :)

Tomorrow my university supervisor, who is a very lovely lady who taught my grade level for over two decades, will be coming to observe me teaching a math lesson! I have a great deal of anxiety surrounding this observation despite the fact that my mentor teacher has assured me it will go well. I worry that teaching out of the book as a lesson won’t be a good show of my teaching abilities. At the same time I know that this what many teachers do. I am coming here to ask for any advice you may have for my first observation. Is there anything in particular I should focus on or be mindful of? I know this is unique for all student teachers regarding both their placements and university supervisors but any advice would be much appreciated!