You will earn 5% cash back on rotating categories, which change every quarter. Note that you need to activate this program each quarter through your online account to be eligible.
Here are the premium rewards expense categories per quarter for this year:
January to March: Restaurant and drug stores
April to June: Gas stations and EV charging stations, home improvement stores, and public transit
July to September: Walmart and grocery stores
October to December: TBA on September 15