The ATO SBSCH have advised that payments need to be received by 24th June, to make the 30th June cut off for 2019. This is only if you want to claim that 4th quarter in this financial year.
Employers with 20 or more employees should have been reporting STP from 1st July 2018. Legislation has passed for smaller employers of 19 people or less to start reporting between 1st July 2019 and 30