Yes, you can condition the field using CB Conditional or I guess just add the IF substitution directly to the layout parameters. The raw substitution value for a progression field gives a value of 0-100 representing the percent complete. Example as follows using layouts.
Code:
[cb:if cb_progress!="100"][value][/cb:if]
Replace cb_progress with the actual name of your field. If you're using the layout usage as described in my previous reply you'd change it as follows.
Code:
[cb:if cb_progress!="100"]
<div>[value]</div>
<div>This is my description.</div>
[/cb:if]
Again be sure to replace cb_progress with the actual name of your progress field.