The update comes with latest Android Security patch, Duo Video calling application and other Android 7.0 goodies. The build number after the update is XT1663_S141_170607_ROW_TO_XT1663_S356_170621_ROW and it size is at around 1499MB
Motorola’s instructions explain that for a successful installation, the battery in your phone should be at least 50% charged and your device should be connected to a Wi-Fi network or LTE.
If you haven’t got the notification of this new software update yet, Just go to Settings – About Phone – Software updates, and It will automatically start downloading the latest update. The update will take around 10-15 minutes to get Installed on your device.