If your application is delayed, it’s usually for 1 of 2 reasons: you may not have enough public watch hours (Creator Studio shows public & private combined), or our team couldn’t come to a clear decision & we need multiple reviews. More info: https://yt.be/help/YPP-review
If you haven't heard back yet, this usually means your channel is being held for additional reviews (bc your content is close to not meeting policies). Take another look at YPP Policies & you can use this time to make updates. More here: https://yt.be/help/YPP-review