Courtroom Seating
All oral arguments are open to the public, but seating is limited and on a first-come, first-seated basis. Before a session begins, two lines form on the plaza in front of the building. One is for those who wish to attend an entire argument, and the other, a three minute line, is for those who wish to observe the Court in session only briefly. Please do not hold a space in either line for others who have not yet arrived.
https://www.supremecourt.gov/oral_arguments/courtroomseating.aspx
Anon could go take a look see.