Hi Shaboom,
My understanding is that they (EK) want you to be current at time of joining....let me explain. Time of joining means that you have passed the selection process and have been given your joining instructions. You don't need to be current on your join date as you will be retrained on an EK aircraft. What I understand by the current in check is that EK don't want to employ someone who has been out of flying practise. You need do nothing but come along and enjoy your honemoon period here. My PPC expired before I joined, but was current at the interview and never was even looked at as an issue when I joined.
Hope that helps, welcome to the pit!