The HAL normal North America boarding pass time pre-COVID was 1:00 PM. Experienced cruisers chose to check-in either early or later which left new cruisers to arrive at the terminal around 12:30 PM to begin their check-in process. All worked well from my experience as the boarding process was spread over about four hours.
With many ships now sailing at 3:00 PM, passengers disembarking at the same time (NLT 9:30 AM), and Room Stewards still having to prepare rooms, the available check-in and boarding processes are compressed.
My advice on another thread was to arrive early if you have priority boarding (mobility challenged with families members, Pinnacle/Neptune suite guests, or 4/5* Mariners). If you do not have priority boarding and have no desire to sit, arrive at the terminal for check-in after the assigned boarding time.