Fuzzy Yellow Balls has many Youtube high speed videos of serves where the camera views from above the server.
In the high level serve shown the racket faces the sky briefly earlier in the service motion. When the arm is up and straight the racket has the edge-on orientation toward the ball. Similar observations for YT FYB kick serve. Others?
[It is difficult to do stop-action single-frame on YT. I get the best results pressing the play-pause button as fast as possible.]
If we had these camera views for the pros they would be ideal for answering another question - How often are the pros looking at the ball at impact? I now don't believe that they look at the ball at impact.