Are you trying to look at the status the same day as your webinar? If GTW works the same as On24, the Attended/NoShow status doesn't change immedeately--the status updates overnight after the webinar is conducted live.
The following day, I'm able to see in the "Members by Progression Status" section on the Program Summary the count of Registred, Attended, No-show, On-Demand. And the MEMBERS tab shows the status of each lead.