Most hotels allow check-in any time after 2 p.m. (local time).
You can find the hotel’s check-in time in the booking overview screen, in your booking confirmation on the app, or in your confirmation email. If you arrive at the hotel before 2 p.m. you can request an early check-in, which will be up to the hotel.
E.g. 1. Booking page
E.g. 2. Booking confirmation page