Interestingly enough I was trying to become a teacher before all this went down. Now all the schools are closed :/
Did they mention anything about you will be doing online only now? I don't want to get too far off the COVID topic, so I guess I won't reply more on this specifically. Just ask them when your start time would be and if it is down the line go ahead and tell them you are interested? That way you can keep your current job and have that option ready to go?