How far you can book in advance depends on where the reservation was booked from.
App: Reservations can be made up to the end of the 2nd month in advance
Example: Reserving on 9/30 will allow you to select up to 11/30
Example: Reserving on 10/1 will allow you to select up to 12/31
Browser: Reservations can be made up to 60 days in advance.
Example: Reserving on 9/30 will allow you to select up to 11/30
Example: Reserving on 10/1 will allow you to select up to 12/1