MQDs will not post until after trip has actually been taken just like any other booking. Yes, main booker will get anything after both taxes and air portion awarded for each traveller on res is subtracted. MQDs from DL Vacations (and current DL Stays promo) bookings are not reflected in pending MQDs balance. There's a calculator that tells you what you should earn prior to making purchase.

Air portion of trip uses Exception Fare calculations and are based on distance, not actual fare paid.
https://www.delta.com/us/en/skymiles...xception-fares

For example below which I chose C+ W fares:
DTW-FLL: 1127 miles x 20% = 226 MQDs each way x 2 = 452 MQDs total.