When does Untitled Oprah Winfrey biographical docuseries return?

Oprah Winfrey is best known for her daytime talk show. She was the richest African-American of the 20th century and once the world's only black billionaire. Her show was the highest-rated television program of its kind in history and ran from 1986 to 2011. She has won 18 Emmy Awards, 18 Daytime Emmy Awards and two Primetime Emmy Awards. In 2013, she received the Presidential Medal of Freedom by President Obama.