Dual training at the moment is very unwise. If you have an ill student, the instructor is very likely to catch it and spread it to subsequent students.
Apart from the risk to students and instructors (do you lose your medical if you have lung damage?) and the issue of safe workplaces, this sort of spread could easily add 2-3 weeks to the lock down of the rest of the economy.
From my understanding of the government announcements today, you can probably stop flying altogether and the government will pay you to pay your instructors $1500/fortnight to sit at home and study for their next rating.