title: Pyinstaller --onefile mode, how to write a message to console before unpacking
body: <p>I have an .exe I'm packaging using pyinstaller and it works like a charm. However when the .exe is clicked, I have to wait nearly 10 seconds while staring at a blank console window for the actual application to start.</p>
  
  <p><a href="https://i.stack.imgur.com/4asvs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4asvs.png" alt="10 seconds of staring at this"></a></p>
  
  <p>From my research I've surmised that this is because of --onefile, and all the various files packaged in need to be unpacked before any code is run. I'm not concerned about the 10 second wait, but new users often need support because they think the program isn't working (reasonably so).</p>
  
  <p>My ask is incredibly simple, but I can't figure out a way to do it: <strong>Is there anyway to get pyinstaller to run a tiny script BEFORE UNPACKING to just post a status blurb to the console, so users know that it's working?</strong></p>