At first, I thought I could label the stories as 'in progress' or 'completed'. But it's hard to say sometime. Many authors are waiting for reader's opinions before they decide to continue the story or not. Sometime, upon the request of readers, the authors add more chapters to previously completed stories. It's hard to track the status of all the stories.

But I can certainly mark a story {Completed} if I see some obvious sign like 'epilog' or 'the end'.