Since gaming now lives at http://YouTube.com/gaming , the old Gaming app is going away on May 30th! If you were subscribed to channels in the Gaming app, they’ll automatically move to your YouTube subs feed on May 14th. More need-to-know info→ https://yt.be/help/yRe4
Thanks for reaching out. As long as your channel meets the YPP eligibility and thresholds, you can expect to hear back soon. It might take a bit of time as applications are being reviewed manually. Appreciate your patience in the meantime.