The NBN upgrade went through over the weekend (see here: https://aussie.zone/post/23680848).

Some providers have switched plans over without customers having to do anything, but others might require you to select the new plan manually. (Those providers are no doubt banking on some people being unaware or forgetting to change - at least for a while - so they don’t need to buy as much back-haul bandwidth.)

New speeds for each tier:

You will, of course, need a fibre connection to actually get these speeds.