Because there have been some crossed wires between the Buzzr and Pluto announcements, I checked Buzzr's schedule for Tuesday, May 28 (it is so weird to finally see Barker Price on there), and Buzzr will be starting at the beginning of season 13 with episode 5391D (originally aired September 10, 1983) at 3:00 p.m. Eastern/12:00 noon Pacific. 5392D airs at 4:00 p.m. Eastern/1:00 p.m. Pacific, and so on for those two hours every weekday. As is Buzzr tradition, the weekend airings simply repeat episodes that aired during the preceding weekdays.
Note that the new-to-Pluto episodes will be airing at 2:00 p.m. Eastern/11:00 a.m. Pacific and 3:00 p.m. Eastern/12:00 noon Pacific, creating overlap. Of course, if you know how to access the Pluto channel, then you've probably already seen the episodes that are airing on Buzzr.