I think the only shift that is totally live and local is breakfast (in Sydney and Melbourne) since that is the only shift where SYD and MEL have their own presenters. I’m not sure what presenters ADL/BNE/PER get for breakfast.
Even parts of the weekday shifts from 10am would need to voicetracked so they can have city specific references (for Syd and Melb at least) since it’s the same presenters nationally … eg. “coming up on Melbourne’s Smooth 91.5”. I imagine ADL/BNE/PER would get a generic voicetrack at these times since it’s only heard on digital radio in those cities.