Depends on the iron fitting. People raise or lower the hand at impact versus address. So static lie angle at address isn’t a consistent indicator as to how it will be at impact.
Straighter legs, less knee bend. Not bent over as much at waist. Those two joints and some back rounding in the upper back all add to how much your chest is facing the ground more or not.
Wow, going for the top right out of the gate. Most of us play in a few state events, club championships, etc... to get a feel for how we react to serious competition. My only advice is remember it is just golf, a game, and enjoy the day.