Be careful as some days the sign says “at capacity for last hour or so”. Depending on how full the queue is, (it could even be cut off sooner).
Right now queue is at two hours after initial rush. Personally, I’d line up an hour before park open, as they start filling the queue immediately. Plus they opened the ride early, so if you were in the first 1000 or so people in line the wait wasn’t too long (and the ride will be working the best it will all day).
My last two visits I tried to ride midday when line gets shorter but EVERY time I tried it broke down. So today I went for first thing in the morning to ensure better chance of success and it was a good quick moving line.