I did my STV in Australia earlier in the year, and had to send my passport to the embassy in Canberra..it was quite an involved process, with National Police Check, comprehensive medical../ insurance/ flights, confirmed ASQ booking, accommodation for first 3 months, I doubt whether you can do it online..even with the easing of some restrictions
I recently had my flights cancelled on the 30 th November..so been trying that one..understand the 11 day part which I may have to forfeit..but there will be more flights early new year..and I'm midway with my vax program which will make it a bit easier also..