The testing on these devices microphones is now complete and as of now you can use the Sonos app on the iPhone 7 and iPhone 7 Plus to tune your Sonos players with Trueplay. You don't need to make any special update, this feature is now available on all the devices here
that are updated to Sonos version 7.0.
Also, with version 7.0 we added support for home theater tuning. So you can now tune your PLAYBARs too.
To learn more about Trueplay take a look here