As I understand it, you have received the packages Sunday evening and they were placed into a hive when?
In essence, you need to keep feeding until they have drawn out the frames, maybe swapping the end frames so that you get them drawn. the rate of taking syrup should tail off somewhat.
They need to draw out comb for the queen to lay in and the swarming vigour will only last so for around two weeks, so needs to be harnessed to get the comb drawn and the colony firmly established and the major waxworks done.
I hope that this has been helpful.
Packages have multiple benefits: they are frame type agnostic, they are less likely to to be a source of varroa and brood diseases and it solves a number of logistical problems for the producer who doesn't have to hold stocks of multiple frame types and foundation sizes for what might be a sideline. All your frames and foundation will be new with full confidence that you haven't got old comb with any attendant doubts that you may wish to entertain.
Do your feeding late in the day when the bees have stopped flying and don't disturb them any more than you need to. the first inspection should be two or three weeks from installing the swarm, because that is what a package has become. A brief check for eggs after a week or if the eyesight isn't up to it, after two weeks there should be sealed brood which is very difficult to miss.
Regards