Payouts are processed on the 15th of each month. To be eligible for a payout on the 15th you must have been eligible by the last day of the previous month.
For example, to receive a payment on the 15th February, you would need to have a payout account set up and the minimum required for that payout destination on or before 31st January.
Envato is an Australian company, therefore the deadline for setting your payout account is 23:59:59.
Please note, if the 15th day of the month falls on a weekend or an Australian public holiday, then payouts will be processed the following business day.