Output to browser as action steps complete

What is the best way to output the status of a running Server Action to the browser?

I have a multi-step database insert/update Server Action, and I would like to display to my browser updates as it reaches/completes various action step.

ex:
Comparing existing values… (new line)
Importing New Accounts… (new line)
Building Output Table…

Spinning Font Awesome icons would be cool too (I think I can manage that, if I can get progress output sent to my page.)

Any suggestions welcome.