There still some people on 10.2 which is v8
See here
Tips/Tricks to getting firmware updates
Biggest thing seems to be make sure you connect to WiFi, you'll still get updates without WiFi but it has been reported here that WiFi increases chances of Firmware Updates.
Perhaps being on a Charger is recommended as well.
I have Chargers at Home & my Office and Strong WiFi at both.
But so far my Updates have come at Home Overnight when I was plugged in.