Motorola has started rolling out Android 6.0 Marshmallow update in India. The Marshmallow update for the new Moto G was released earlier in the US and Canada.
There are a lot of improvements under the hood with Marshmallow including better performance, battery-life and better security as well. You have granular app-permissions built-in to give you more control over what data/services apps are allowed to access.
Motorola Moto G (3rd Gen) Specs and Photos
Apart from the Moto G 3rd-gen, the Moto X Style, Moto X Play have already received their Marshmallow update in India. The Moto E (2nd-gen) 4G has also been added to the list of Motorola devices getting updated to Marshmallow but there is no timeline as to when its going to happen.
Coming back to the OTA update for the Moto G3, it weighs in at 445.5MB. You can head over to About phone -> Software updates.
