

If OP’s plan is similar to mine, there are three pricing periods during the day: standard rate charged in the morning/early afternoon, highest rate charged during peak hours of the afternoon, and then a discounted rate charged in the evening/night.
The idea is to encourage people to do energy intensive tasks like running dishwashers and laundry at night when the demand on the grid is lowest.
ETA: Sorry, to actually answer your question, yes you could blast the AC early in the day to “pre-cool” for the peak hours. My ecobee is linked with my utility account to sync with the different pricing periods and does exactly that.
My thermostat automatically drops to 65F/18C at 8PM.