Update: I Made it to the Highly Qualified stage
I have received confirmation that my references received letters (and in at least one case also a phone call) from NASA regarding my astronaut application. This means I made it to the "Highly Qualified" round (top 450 applicants)! Below you can see the letter I received from NASA this week asking me to get a medical exam. Please keep your fingers crossed for me that I make it to the next interview stage.