One guesstimating for a possible all safe day.

1 April 2020
+84 days (the number of days Wuhan was on lockdown)
——————————
= 24-Jun-2020

Have of that is 42 days which happens to be 14day incubation + 14 +14. Which sounds like a pretty good period of time to knock transmission down a lot

1-apr-2020
+42 days
——————
13-May-2020

Any time time between those dates sounds reasonable to do something prudent——-whatever that is.

I see a pinprick, rapid blood test before going through TSA and a certificate you hand to immigration at your destination and any connecting points in between.

They may want to prick you again. Your hotel or cruise ship may want to see certificate.