@Bakool if you open the Rewards menu, you would see it shows like below:
Key part: 
Then there’s a banner on the top of this website which shows info from Ads Payout Status Update
We view ads and it accumulates, then it pays once per month. Payouts begin around the 7th of each month and can take anywhere from a few days to a few weeks to complete. Unless any issues, usually payouts complete within a week.
NOTE
Rewards is going to be changing drastically this year.