I have never seen it used as moss replacement, as that is what I assume you intend. I would be reluctant for a number of reasons:
This link [url]https://www.anbg.gov.au/gnp/interns-2005/prostanthera-cuneata.html[/url] describes it as "evergreen shrub to around 1 m tall".
Although Thyme are also shrub, they will not grow that tall. So there may be the risk this will not end up as a ground cover but as a garden cover. So if at all you should have the prostrate specimen.
"The prostrate form makes an excellent ground cover and looks lovely in a rockery with its dense, shiny foliage and delicate, white flowers."
Also I would probably prefer less conspicuous flowers and flowering.
"The flowers are a very attractive trumpet-shape, coloured white with many purple, red or yellow blotches in the throat..."
A ground cover should be greenish most of the year (look like distant forest). I do not know when, how long and how often they will bloom.
But I am not sure I have ever seen it in real life, which could relax the above reluctance.