HEADS UP!!!!
Delaware does include colleges in the definition of safe school zone. Here's the definition right out of Title 11:
“Safe school and Recreation Zone” defined as: Any building, structure, athletic field, sports stadium, or real property owned, operated, leased or rented by any public or private school including but not limited to, any kindergarten, elementary, secondary, or vocational-technical school or any college or university or within 1000' thereof
I'm not sure if UD owns or uses any property(bookstores, admin offices, dorms etc) on Main Street, but if they do, 1000' could include almost half of Main St. I would err on the side of caution and not carry there.