I asked a refund for a subscription that was done by mistake, it is accepted but there’s no refund in my account yet.
Welcome, and thank you for posting in Apple Support Communities.
If we understand correctly, you have already been approved for a refund, and you just need to know how long it takes to be applied back to your account.
See How long refunds from the App Store or other Apple service take. It should help with know what to expect next after being approved.
Let us know if you have further questions.