Showtime has announced that it will offer a 30-day free trial to new customers. The offer is currently available, and viewers who sign up before May 3 can access the network’s original series, documentaries, specials and movies online via the Showtime streaming service. With millions of Americans self-quarantined at home, there's no better time to give Showtime a shot. The network is currently airing the final season of its top-rated drama Homeland, and there's plenty of time to catch up on the series before its grand finale on April 26. I've been binge-…