Most applications are reviewed in about a month or so. Each channel is being checked by our review team, so it may take some time! While waiting, here’s more info about the review process: https://yt.be/help/YPP-review
If you still haven’t heard back, it’s usually for 1 of 2 reasons – you don’t have enough public watch hours, or your channel requires additional, in-depth reviews since the content is close to not meeting our policies. Hopefully you don't have to wait much longer for your update.