Which tense to choose: "Is dinner ready? - I'm afraid, it isn't. The potatoes are not done/haven't been done yet."
To say the potatoes are not finished cooking
The potatoes are not done yet.
the potatoes are not finished cooking
If you say
The potatoes haven't been done.
the potatoes have not been prepared yet
that would mean no preparation has been made for the potatoes e.g. they have not been boiled to make mashed potatoes, in the second sentence "done" = "prepared".