If you want to track your fantasy football team's performance on game days, take a look at this video from ESPN discussing the Fantasy Cast application on the iPad or computer and the mobile webpage that will allow you to track your team's points instantly, across all games that are occuring on that day. No matter what, you'll be able to know how your ESPN fantasy football team is performing.
ESPN fantasy football is available for free at the ESPN site.
Have an iPhone? Check out all 200+ new features coming in iOS 13.