This link enables you to see which areas and buildings have NBN available, which is the national fibre-optic network.
http://www.nbnco.com.au/
If an address is listed here, you will have access to the NBN network through any of the available providers, with speeds of up to 100Mbps download and 100Mbps upload.
However, most people only take up to the 100/40Mbps plan due to the high cost of the 100/100Mbps symmetrical plan, in addition to the fact that only certain providers offer them.
Examples of provider/plans: https://www.skymesh.net.au/services/nbn/fibre/plans.php
https://www.tpg.com.au/nbn/