Hi,
I looked up that function and it appears only to return the WordPress status of the post so Published, Draft, etc..
So it does not have the capability of only returning future events.
I did come up with a snippet that runs a WordPress Query for Future events only and then you can echo the post count or assign it to a variable or anything else you would like.
Here is the coding:
https://gist.github.com/jesseeproductions/ebc7fbaa44f2ce336dbe
That should get you close, but you may have to play around with it to get it closer.
Let me know if you have any follow up questions.
Thanks