My understanding is that if the athlete is correctly undergoing Hormone Replacement Therapy (HRT) the biological advantage is significantly reduced if not removed. I am sure there are exceptions though.
Edit: Everything below
After looking through some studies it seems like Trans fem athletes do maintain some advantage, or atleast the current wait time is not enough for the edge to be eliminated.
Best example I could find https://www.bmj.com/company/newsroom/current-treatment-period-may-be-too-short-to-remove-competitive-advantage-of-transgender-athletes/
I was entering my appartment lobby as someone was going to leave (door swings out). I went to open a door for them, stand to the side, and let them out before going in myself. However, I went for the handle as they hit the auto handicap door opener so I am just standing there sudo holding the handle as it SLOWLY self opens and waiting for them to go through.