The Galaxy A7 2016 variant is now receiving the latest October security update now, and you should install it as soon as possible. This update will patch all the security gaps on your phone, along with some stability improvements, this firmware comes with build number A710MUBU2CQJ1 and might be under 500MB in size or less.
Moreover, this update is over-the-air, but it will still take some time to reach across the globe, as it covers one region at a time. So, be patient with that. However, you can keep checking it manually by heading over to Settings >About Phone > System Software updates.
Also, its always recommended to download it via WiFi, rather than data as it might result in data charges once you run out data, and the download size was more then you expected. Apart from that, your phone’s battery should be more than 60%, to avoid any failures during installation.
Furthermore, the Android Oreo update for this model is not expected, while the 2017 model could have a chance to make it to the Oreo list. One report says that Samsung has planned a list of countries for Android Oreo, but it will be probably for its current flagships, that’s the Galaxy S8/S8+. And its expected to official roll-out in 2018 as confirmed by Samsung Turkey.
For a complete overview of what device will get the Android Oreo, here’s a list of all Samsung device’s that will get Oreo update, the Android Oreo 8.1 is has also been released by Google and will be coming soon flagship Samsung devices.