I’m not sure that is correct; I mean, the 8pm is correct, except I think it is 8pm central time.
Several states are in 2 time zones. They are supposed to wait until the later time zone has closed before they report -- but they do not always wait.
Indiana
Kentucky
Florida
New Hampshire (different precincts close at different times)
Michigan
Texas
North Dakota
Idaho
Oregon
Also, some precinct closings throughout the country may be extended due to equipment problems, etc., so the exact times may vary.