That was one I was not aware of and was excited to see. However upon digging, the grocery is limilted in both spend and has an expiration. From the card term details - bolding mine:

Furthermore, all eligible grocery store or supermarket transactions on USALLIANCE Visa Signature Cards will earn four (4) additional bonus points per dollar until 12/31/2023. Maximum number of points earned per eligible grocery transaction is six (6) per dollar. The four (4) bonus points promotion is limited to $2,000 spending at grocery stores per calendar month; after $2,000, cardholders earn one (1) base point and one (1) bonus point on all eligible purchases for the remainder of the calendar month.

Too bad. Limit of 2K per month seems generous, but the end date not so much.