ABC published an article on this this week:
As Omicron cases soar, many people are faced with having to re-book their vaccination appointments. Here are some principles to help you decide when to lock it in, writes Margie Danchin.
www.abc.net.au
You can get your booster as soon as you are recovered, but may choose to wait.
Note that NSW CHO Dr Chant stated this morning that a recent covid infection gives you an automatic 1 month exemption from needing to test and ISO if exposed as a close contact again. But after a month, there is a risk of re-infection, so same rules apply as they do to others who have not had covid.