https://techcrunch.com/2019/01/08/google-assistant-lock-screen-access-is-coming-to-more-android-devices/

Here’s a quick tidbit buried beneath today’s deluge of Google Assistant news (not to mention the bizarre waking nightmare that is the CES Small World ride). The company announced today that the smart assistant will be accessible on more Android phone lock screens.

The feature was first announced back at Google’s hardware event in October, though at the time, it was limited to the company’s new Pixel 3 handset. For security reasons, it’s available through opt-in, meaning you’ve got to tick the box in settings.