The deadline for applying for your matching .au domain name expires on 20 September 2022.
If your business uses a .com.au or .net.au domain name it is essential that you apply for the corresponding .au domain name, for instance if you own PetersWonderfulPlumbing.com.au then you can apply for PetersWonderfulPlumbing.au. If you registered your primary domain name prior to 4 February 2018 then you have Category 1 priority, and if you registered after 4 February 2018 then you have Category 2 priority rights.
In order to apply for your .au domain name you will need your token which can be obtained from auDA here: https://priority.auda.org.au/. You can apply for your .au domain name through any auDA Accredited Registrar.