They still do both, but most days it's either an early morning OR a late night at one of the four theme parks.
Here's the base schedule:
Monday: Epcot AM
Tuesday: MGM AM, AK PM
Wednesday: MK PM
Thursday: Epcot PM
Friday: MK AM
Saturday: AK AM
Sunday: MGM PM
Tuesday is the only day with both early and late hours.
This schedule is subject to change to accommodate special events and holidays. Since the EHM change occurred around the first of the year, this has been the schedule about 80+ percent of the time.