How do I track and view total stand time using the Apple Watch?
As you stated the apple watch counts the stand goal as 1 minute of standing every hour for 12 hours. 

from Apple 


  "The Stand ring shows hours in which you've stood and moved for at least a minute. Complete your daily Stand goal by standing up and moving around for at least 1 minute during 12 different hours in the day. Even if you stand all day, you still need to move around."


As far as I am aware there is no other metrics that are viewable to the user.