Here are the steps to do this. I've done it in your file, though I left the last column intact.
First, you have to update your formula to show Done when the conditions are met. So the formula in L becomes:
Formula:
=IF(J3<>"","Done",TODAY()-H3)
We keep the flag formatting, and add another rule to make it green when Done. See the CF rules for that.
To allow "Done" to be visible, we have to turn off the checkbox in the icon rule that says Show Icon Only. When the box is checked, the cell value is not displayed.
One last step. Now, if the cell is not "Done", it will show the number of days calculated by the formula. To suppress that we use custom formatting:
;;;@
This format means that if the value is a number, do not show anything, but if it is text, show the text.
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