I would suggest nesting boxes with lids just in case... also do you plan on raising ducklings if so the eggs need to be brought inside into a brooder, but otherwise I think the eggs would be fine to eat ... but I would open one or two first just to be sure.
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a Hen should have "0" curly feathers. Drake ducks should have curly feathers. I will also place bets that if you wait another 20 weeks you will still be waiting on eggs.
CORRECTOMUNDO
Q#1 - Mallards are great mommas and daddies too but it can vary per duck so watch out
Q#2 YUP normal mallard egg coloration
Q#3 Take turns and depends on which duck the mallard is paired w/
Q#4 a week at most but check every few days...