The Google Pixel phones, in the United States, Canada, the United Kingdom, Australia, India and Singapore, now support Instant image search and utilization through Google Assistant.
Google Lens is now (or soon will be) available on Google Assistant and you can access right from Google Assistant with a swipe up from the bottom-right corner.
All these features is an update to the Google Assistant app. Remeber that Lens is already being used for face and objects recognition in Google Photos. This just takes the need to save an image file away from the process.