08:30-17:00; Oct Su[1]-Apr Su[1] 08:30-18:00

In English: open 08:30 through 17:00 normally, but from the first Sunday of October till the first Sunday of April it's open 08:30 through 18:00

https://en.wikipedia.org/wiki/Daylight_saving_time_in_Australia (I had to check when DST happens in NSW)
https://openingh.openstreetmap.de/evaluation_tool

Try pasting what I made here to test it out. I think it's correct, but you may want to double check it.

https://wiki.openstreetmap.org/wiki/Key:opening_hours#Exception_based_on_month