Hey there. If you haven't heard back yet, this means your channel is being held for an additional review by putting extra efforts and resources before making final decision. It does take a bit of time as all applications are reviewed manually. Hope you hear back soon.
As we review all applications manually, this process takes time. We recommend uploading more public & original videos as the more content for us to review, the better! More info: https://yt.be/help/AsbB