That is what we don't want to see. Human raised ducklings do not know squat on how to survive in the wild. They have been dependent on us humans to feed and care for them.I would what till feather have grown but keep them out side 24/7 for a week or two before they go. Then find a safe pond where you can visit and release them into the wild.
OP is working hard to find a place for them where they will be cared for by those who know how to raise and release wild ducklings into the wild once they are old enough. I commend her for that.