I don't believe that it is generally agreed upon where the great filter lies. We could already be past it. Finding multi-cellular life elsewhere in the solar system would support the hypothesis that the great filter lies ahead of us. But, we have not done that.
Why would the great filter (between current circumstances and astronomically-visible artificial events) being ahead of us imply there being no humans in the future?
A blog post by Athrelon on More Right.