“ Downton Abbey: The Grand Finale ” is heading to Peacock next month, the streamer has announced. STREAM ‘DOWNTON ABBEY: THE GRAND FINALE’ ON PEACOCK The third and final “Downton Abbey” movie will be available to stream from home on Peacock beginning Nov. 7 after it released in theaters on Sept. 12. Continuing the popular TV series, “The Grand Finale” was a hit at the box office, making $100 million globally, and it was well-received by longtime fans. All six seasons of “Downton Abbey” are also