OC Jumbo Cactpot gets drawn at 09:00 UTC, so for Australians this will be between 17:00 and 20:00 local time depending on time zone.
Quote Originally Posted by Patch 6.08 Notes: Known Issues
An issue wherein the times displayed for the Jumbo Cactpot drawing are incorrect. (Oceanian data centers only)
* The winning number for the Jumbo Cactpot is drawn every Saturday at 1:00 a.m. (PST). Please note this issue only affects the time displayed and not the actual lottery drawing.