Do you mean on your phone or on maps.google.com? It isn't really designed to give you a day's schedule (AFAIK), but you can adjust the "leave by" / "arrive by" times to get the bus schedule for whenever you actually want to make the trip. If you open up the route, you can also click on the element in the list (i.e. if I click on a green line segment of a route in Chicago), and then there should be a "route information" link to the transit authority's website, that should have the day schedule info.