Update: 14/06/2020
I have received an email from a UK buyer yesterday notifying me that she have received her order. Orders from the US and UK have slowly arrived one after another but for Australia's orders it has yet to leave Singapore.
Have contacted the post office and spoke with an agent but the answer I have gotten was due to no available transport at the moment and was advised to continue waiting for the update once there's transport available.
Also, it seems to be me that there will be significant delays to Australia given what I have read on their national post website.
Australian Post. Coronavirus: International Updates
also update on the Singapore Post
Stay safe, take care everyone.