Motorola has already ditched Moto G 3rd generation from the list of devices getting Official Android Nougat. However, The Moto G 3rd Generation is now getting new software updates with Security Patches, bug fixes and Stability improvement.
First update contains July Security patch and costs 12.9MB, the new build no. is 24.71.2.en.03. The Second update contains October Security patch and costs 63.7MB, the new build no. is 24.201.5.en.03.
Thanks Prashanth Reddy Nall for tip!