Looks like they have come up with a new program to replace the extra miles for grocery purchases which ended last month. Just spotted these two new offers which you first have to be offered and sign up for:

Through 12/31/20, earn 500 bonus miles and 500 Medallion Qualification Miles (MQMs), after you spend $1k in purchases on your Delta SkyMiles® Platinum Card or Delta SkyMiles® Reserve Card, up to 25,000 miles and 25,000 MQMs. Purchases made on Additional Cards do not qualify. Enrollment and terms apply.

Enroll your Delta SkyMiles® Platinum Card or Delta SkyMiles® Reserve Card today and start earning 5X miles on Delta purchases made with your Card through December 31, 2020. That’s 2 additional miles on top of the 3 miles you already earn. Terms apply.