Hotel check-in policies vary, but the standard check-in time is usually around 3 PM local time on the day of arrival. If you require an earlier check-in, it's best to contact the hotel directly to accommodate your request, subject to availability.
Some hotels also offer online check-in options through their websites or apps.
Here at AllFly, we are big fans of downloading the hotel apps when possible, and using the mobile key feature (skipping the check-in process altogether)!