That's cutting it close (no pun intended). I've gone in around 2pm and there was a 30 minute wait. While I was waiting, the line had grown by another 3 people. By the time it was our turn, the wait was about 1 1/2 hrs.
It had grown that much because like me, I had 2 kids to cut, the people in front of me had 3 kids + 2 dads ,the people behind me had a baby, 1 toddler, 1 dad. Each of those would take a minimum of 15 minutes to cut and they only have 2 barbers working. Not to mention if the kids are uncooperative then it takes longer.
I would say if you can't do it first thing in the morning, then do it another day. Or see how things are first. If the line is to the door by 2 people, skip it.