Luggage isn't Delta-specific if travel is on a single ticket. The OP is entitled to the luggage allowance permitted under the most significant marketing carrier rule enforced by the U.S. DOT. That allowance is maintained throughout the itinerary, even when departing on DL-operated segments.

Customs & Immigration formalities are in MSP as the first U.S. entry; baggage may re-checked to IND immediately following Customs.