Thanks for reaching out – most creators hear back in about a month or so. All applications are still manually reviewed, so it does take a bit of time. In the meantime, you can revisit the review process here: https://yt.be/help/YPP-review . Hope you hear back soon!
You should have received an email and a message with more info in Creator Studio, including detailed resources and next steps. Note: if you were removed from YPP for policy reasons, you can always reapply in 30 days.