This 5.7-inch handset that launched almost a year ago now finally surfaces on Geekbench running Android 7.0, so the update should arrive soon, especially since T-Mobile released it and then stopped the rollout, probably due to a last-minute issue.
http://www.notebookcheck.net/LG-Stylo-2-Plus-hits-Geekbench-with-Nougat-on-board.200854.0.html