Or, at least it has in my version of Google AI Studio. I don't know if it's going to roll out evenly to everyone in our Google Workspace. But if you don't see it yet and want to try it out, check back in another day or two. This is what it looks like:

Note that usages are still limited in Google AI Studio, so use it judiciously, at least until it comes out in our regular Gemini system.