Comment on Important: PSCONFIG is mandatory for July 2015 CU for SharePoint 2013 by Stefan Goßner

Hi Shail,
only when your farm was on a level from July 2015 or older you have to run it right away.
Otherwise you can schedule running PSConfig to a later date.
But if you plan to delay running PSConfig ensure to run the “install-spapplicationcontent” cmdlet to ensure that the correct DLLs get loaded.
Cheers,
Stefan