Although some English test providers have launched tests that can be taken at home in response to the impacts of COVID-19, such as TOEFL iBT - Special Home Edition, OET @ Home and IELTS Indicator, these are not accepted by immigration.
See here the accepted tests and the scores for Skilled visas.
For more information on specific testes, please see links below:
Note there is exception for Competent English if you are a citizen of and hold
a valid passport issued by the United Kingdom, the United States of America, Canada, New Zealand or the Republic of Ireland.
Source: Source: IMMI 15/005