Demand response EV charging is already widespread.

The general rule for most people with EVs and a place to charge at home is just to always plug it in when they get home, with charge settings (battery charge limit, scheduled departure time etc.) set on the car or using the car's app.

In addition, utilities in almost every grid that has capacity issues - Texas, California, downstate NY - offer heavily subsidized or free 240v Level 2 smart chargers that are enrolled in demand response programs.

So you get home at 5pm in July, plugin to your utility provided charger. Demand response will prevent charging until 7pm when the peak passes. You can override it, but if you observe the curtailment you receive either a credit on your bill or a reduced rate for off-peak charging.

Cars are smart enough. My 2022 Mini Cooper SE lets you set or schedule departure time. Most new electric cars let you set desired charge level as well, and will delay charging until it's needed.

Most vehicles/chargers have the ability to optimize for using off-peak hours (and if a utility financially incentivizes using power in those hours, users tend to use that capability).

There are options to set your charge time in the cars so you can choose your times. They can also do it intelligently too, like start charging at a time so that it's full by 7AM.

Almost all EVs come with built in charging schedule settings and people use them because the alternative is throwing money at your utility company to charge during peak hours for no reason. You just plug it in and wake up charged in the morning.