My name is XXXXX XXXXX I am an experienced small animal veterinary surgeon, I will be very pleased to work with you today and will try my best to answer your question to your satisfaction.
This is no problem, most pups have worms so they should be wormed on a regular basis. You can just pick up some worm tablets from your vet or a better pet store and work the little pup when he arrives. This is not likely to have affected his heath in any way.
so when I pick him up on Monday, I already plan to take him to a local vets for vaccination on either Monday PM or Tuesday depending on vet availability then the worming can be done then