In a busy restaurant with many stations (host starters, cold starters, salads, fryers, grill, etc) it's good to be able to tick-off/clear the dishes that have been served and have the remaining dishes appear on the KDS.
We want this, too!
It's not possible to add a checkbox option to check the items once they are ready to eb delivered. It would be interesting to understand your situation a little bit more. Do you run a big restaurant, is there many cooks in your kitchen?