I noticed in my app this morning that this quarter's cash back categories have been updated and now show "New! The Home Depot (June)" in addition to Gas Stations, Uber, Lyft, and Warehouse Stores.
I'm guessing they added Home Depot since most people aren't buying Ubers or Lyfts (or gas) right now. As far as I can tell, no further action is required if you've already activated CB for this quarter.
Footnote 2 You activated to earn 5% Cashback Bonus at Gas Stations (stand-alone), Uber, Lyft and Wholesale Clubs from 4/1/20 (or the date on which you activate 5%, whichever is later) through 6/30/20, and at The Home Depot from 6/1/20 (or the date on which you activate 5%, whichever is later) through 6/30/20, on up to $1,500 in combined purchases. The Home Depot name and logo are registered trademarks of Home Depot Product Authority, LLC. Purchases made at Gas Stations include only merchants in the category that sell automotive gasoline that can be paid for either at the pump or inside the station. Gas Stations affiliated with supermarkets and supercenters may not be eligible. Uber and Lyft purchases include only transactions made for Uber and Lyft Rides in the United States. Uber, the Uber logo is a registered trademark of Uber Technologies, Inc. Lyft, the Lyft logo is a registered trademark of Lyft, Inc. Check with your Wholesale Clubs to make sure your Discover card is accepted. Purchases of affiliated Wholesale Club services, such as travel and cell phone purchases, may not be eligible in this category. Individual merchants and stand-alone stores within physical Wholesale club locations, or online, may not be eligible in this category. Listed merchants are in no way sponsoring or affiliated with this program. Certain digital wallet transactions qualify for 5%, for more information see Discover.com/digitalwallets. Purchases made through third-party payment accounts, mobile or wireless card readers, virtual wallets or similar technology will not be eligible if the technology does not provide sufficient transaction details for rewards qualification. 5% Cashback Categories: In accordance with standard industry practices, merchants are assigned a merchant category code (MCC) typically based on their line of business, or the type of products and/or services they primarily sell or provide. Discover Card does not assign MCCs to merchants. Even if you make purchases at a merchant of items that appear to fit in a rewards category, the merchant may not have an assigned MCC in that rewards category. Only purchases made from merchants located in the United States are eligible for 5% Cashback Bonus. Rewards are added to your Cashback Bonus account within two billing periods. See Cashback Bonus Program Terms and Conditions for more information about your rewards.