Information on Underground timetables is given here on the TfL website (https://tfl.gov.uk/tube-dlr-overground/status/ ). You can also get a live feed of when the next trains will arrive at Osterley Station from the same page by selecting Osterley Station in the search box just under the map.

If you’re interested in where all the trains are on the tube network, the attached link gives a live view of every train (https://traintimes.org.uk/map/tube/ ). There are 3 different views (Geographic – train positions shown on a map, Schematic – train positions shown on a tube schematic, and Skyfall – skeletal schematic showing train registrations).