It’s been a year since Apple brought its Siri personal assistant to macOS Sierra, but it’s still lacking the hands-free ‘Hey Siri’ voice control.
Currently, you have to press the Siri icon in the menu bar or dock or use a keyboard shortcut to access Siri.
That may change soon according to developers who’ve been digging around in Apple’s macOS and the BridgeOS 2.0 software package.