Read google voice search safari extension for more information.
Try this updated article on how to add voice search.
Mac Assistant runs in the menu bar. The first time you click the menu bar icon, you’ll be asked to sign into your Google account.
After that, you’ll see a microphone in the pop-up window. Tap it to start talking to Google Assistant. You can also trigger the assistant by tapping the left Command key two times.
There’s not a lot in the way of visual feedback: you’ll see the words you said transcribed, and that’s about it. As of this writing, there’s no way for the application to visually show you things, and you won’t get the file system integration like Siri offers. You can ask questions, and that’s about it.
Even so, it’s remarkable how quickly this tool can react to speech. I asked it about the weather, my calendar, and obscure questions about world leaders, and got answers instantly. I even asked it how many tablespoons were in a quarter cup, and found out right away (it’s four.) Give this a shot, and compare Google’s responses to Siri’s. Neither is perfect, but it can be fun to compare the two, so enjoy.