Speaking as someone working in travel, the international travel ban is already coming, but all countries are making their own decisions
Australia / NZ have said they will refuse entry to all non-citizens overnight, joining a few other countries already in that status, such as Costa Rica and various European countries.
Several other countries have banned / are banning all international flights - Rwanda was the one relevant to me this morning, but Egypt and a few other countries had announced that step already.
The balance is allowing everyone currently away from home time to get back, but a few countries are being added to both lists each day.
My last passengers are due to come back home on Saturday - hopefully that will still be operating.