Policy certificate is good for 1 year, if yours have already expired, go ahead to have it done now!
For me, the medical exam must be done in the country where my interview is hold, but since I'm currently living in the US, I have to wait after I get back to Japan.
Waiting game doesn't end when your CN became current, waiting for the 2NL is more stressful, it doesn't get any better, trust me!