To find out what programs are on PBS tonight, you can check the PBS TV schedule on their website. You can also check TV Insiders PBS schedule and listings guide. Additionally, Masterpiece has its own schedule page on the PBS website. On TV Tonight also has a PBS TV listings guide. Here are some steps you can follow to check the PBS TV schedule:

1. Go to the PBS TV schedule page.
2. Select your local PBS station from the dropdown menu.
3. Scroll down to see whats on PBS tonight and check future TV schedules.

Alternatively, you can check the TV Insiders PBS schedule and listings guide or Masterpieces schedule page for a complete schedule of everything airing on PBS over the next two weeks. On TV Tonight also has a PBS TV listings guide.