Since validatorset info is updated every day UTC 00:00, to make some room for the error handling, we distribute the fees of day N-1 in the next breathe block (day N+1). Thus, after you sent delegate transaction, you will receive your first staking rewards at the second UTC 00:00. Afterwards, you will receive your rewards everyday at UTC 00:00.  Your rewards will be send to your delegator address on Binance Chain directly.