Depending on the plan/if you get a phone, you can get up to 20,000 points, or 10,000 points if you just get a plan.
Deal ends tomorrow night.
From the site:
Now’s the perfect time to earn heaps of Qantas Points with a Vodafone plan. Sign up or upgrade to our $60+ Red Plan, Red Plus Plans, 12 month SIM Only Plan or 12 month SIM Only Plus Plans to get 10,000 bonus Qantas points. Don’t miss out – offer ends 14/11/18. T&C apply.
The coverage is awful on Vodafone if you're traveling around Australia! It's also still patchy in some inner city areas.
Check out coverage (and not just on their website) before you hop on board.
edit: typo