@rutikeshshende I recommend checking out the information that’s been shared, including links. For instance, the banner at Ads Payout Status Update clearly states:
Please note that the payout beginning in September is for Brave Ads earnings throughout August.
So, when it says payout for August Rewards, it refers to the September payout, which is still processing.
As I mentioned earlier, the notice on devices is just timed for when payments start. It doesn’t have the precision to notify individuals as their payments are sent.