DL now has a "baggage calculator" where you can enter the characteristics of a proposed trip and get a baggage cost estimate.

https://www.delta.com/us/en/baggage/overview and scroll down the page to "Calculate Baggage Without a Trip".

Enter type of fare - from Basic Economy to Delta One
Enter Medallion status - from Non-member to Diamond Medallion
Enter which DL Amex card held - from none to Reserve
Enter number of passengers

Seems pretty comprehensive to me.