No, 10.12.7 is the right version. It's "available for" 10.12.6, which means that is the version that will be offered the update. I am not sure why it's not show

No, 10.12.7 is the right version. It's "available for" 10.12.6, which means that is the version that will be offered the update. I am not sure why it's not showing up for you. Consider contacting Apple support.