I think it is very unpredictable because it is the first weekend after the Tonys. Also, I do not think they sell standing room until after the show is sold out.
I went to see the show last Sat night. For that Sat afternoon, the show was not sold out until around 1pm, so I do not think they sold standing room until then. In any event, there was no standing room line at the box office when the "this performance is sold out" signs went up for the matinee at 1pm; I assume that this is because it wasn't clear whether they were selling standing room at all, but I am not sure of that. It is possible they sold standing room anyway in anticipation of their selling out and they were all gone already.
For the evening, I believe that the last person to get standing room tickets showed up around 5:10pm. The Sat evening performance was sold out before the matinee was, so it was clear that they were going to sell standing room that evening.
"What was the name of that cheese that I like?"
"you can't run away forever...but there's nothing wrong with getting a good head start"
"well I hope and I pray, that maybe someday, you'll walk in the room with my heart"