The official interactive map for the NSW Rural Fire Service is also an eye opener, as it shows the actual areas burnt in roughly real-time.

https://www.rfs.nsw.gov.au/fire-information/fires-near-me

In the past month it started out as isolated black patches, which have now merged into fewer but bigger black patches. Given the heat predicted over the next few days and lack of predicted rain until January, there is every chance that more of the fires will merge. The NSW fires are spread over a distance of 1000km, with the larger individual fires being about 200km in length. The map shows only NSW's fires, so multiply that view by about 6 to account for the rest of the mainland.