Hello JP, you can achieve this by using “Process Queue” in Mendix, so that Microflow will execute the action simultaneously while you can continue your work. Also Process Queue can execute that microflow within a short time. If you configure the same thing what you have configured in that microflow, with Process Queue then as you asked it will show that message with progress bar for few seconds only.  
FYR – Process Queue | Mendix Documentation

Hope this helps you!