https://wccftech.com/android-oreo-update-for-att-and-verizon-samsung-galaxy-s7-rolling-out-oneplus-6-gets-selfie-portrait-mode-and-more/

Galaxy S7 owners on the AT&T and Sprint networks rejoice! Samsung has finally begun rolling out the Android Oreo update for their nearly two-year-old flagship for the Snapdragon-powered devices. It is worth noting that Exynos-based devices received the update much earlier and like with the Galaxy S8, Snapdragon variants of the devices had to wait a bit longer. Unofficial ports of the update have been around online for a while, but installing them isn’t for everyone. Software version G930VVRU4CRE5 for the Galaxy S7 and G935VVRU4CRE5 for the S7 Edge are rolling out. AT&T is also rolling out the update. Build number G93xAUCU4CRE4 is available for both Galaxy S7 variants. Here’s the changelog that Verizon posted on their website:

The update weighs in at a colossal 1.9GB and will take a while to install. This is very likely the last major OS upgrade the devices will receive, as it is rare for any device to receive more than two of those. To check for the OTA update, go to Settings > About Device > Software updates.