The beta was supposed to end today, however it will now end tomorrow, giving those who haven't had a chance to play yet one more day to do so.
"We hope everyone has been enjoying the Overwatch Open Beta," community manager Lylirra wrote in a post on Battle.net.
"We certainly have! We've loved being able to play alongside you on PC, PS4, and Xbox One. Over the last week, we've also had the opportunity to listen to your thoughts and opinions on the game; make improvements based on your reports in these very forums; and collect invaluable data just from you playing normally.
"We couldn't be more grateful. So, as a small way of saying 'thank you' to our community and the millions of players who've logged in so far, we will be extending the Open Beta by one day on all platforms. This means the beta will now conclude on May 10 at 10:00 a.m. PDT in all regions."
Have you tried the Overwatch beta?