The "Users Online Now" box has three categories: Members, Guests, and Robots. Typically there are far more "guests" than "members". (Right now, at 8:15 PM EST 11/19/2023, there are 39 members and 531 guests.) I cannot find an explanation of what a member is. Anybody got a link?
A member is someone who is signed in. A guest is someone viewing but not signed in or who doesn't have an account. A robot is typically a web scraper used by search engines. Also their is typically a time delay to allow for short periods of inactivity so it is closer to people who have done something in the last 5 minutes than online right now.