A separate news story, however, says Qantas may not resume international flights until July of 2021:

Australia’s national carrier Qantas will require future international travelers to prove they have been vaccinated against Covid-19 before flying.

Source: Qantas to require Covid vaccinations for international flights | CNN Travel

The International Air Transport Association (IATA) expects to roll out a digital IATA Travel Pass in Q1 2021, which would hold a secure record of your vaccination history (including potentially other vaccinations), and even support a future digital passport.