Actual maps here on the DMV announcement page: https://www.dmv.ca.gov/portal/vehicle-industry-services/autonomous-vehicles/autonomous-vehicle-testing-permit-holders/waymo-approved-areas-of-operation-for-driverless-testing-and-deployment/
It's a large expansion.
In the Bay Area, the area of operation is extended all the way to Sacramento, and well into Sonoma County.
In SoCal, it's the whole coastal corridor between LA and San Diego.
I live in San Francisco, where Waymos are ubiquitous, and I have to say that they're actually good drivers.
I've seen them make difficult turns, merge lanes in heavy traffic, and wait patiently while some car ahead of them puts on their emergency lights, and the driver runs inside to get their takeout, but the Waymo can't go around them due to traffic in the left lane.