that mean that lawfully check your case with uscisfor the last time the 13th of September

I think lawfully checks the case status a few times a day, but their prediction is only revised once every week.

uscis received my medical rfe on 13th September as per fedex tracking information. but no update from Uscis.

yes, USCIS is famous to forget updating our status. If there is no update for too long, you should call their customer service and ask about it.

do the officers havev to adjudicate cases for this fiscal year by sept 30 or can they do it afterwards too?

if they want they can issue green card on September because lots of visa gonna spoiled.