you are non US -IMG...it is tough to work like that..
one of the most important thing is you have to get ECFMG certified before rank order list of MATCH ..the ROL generally gets final in mid february..
if you get your diploma certificate atleast 6 weeks before that in that busy time of match season ..(because ecfmg needs the diploma certificate for credential verification.)it will work..other wise even if you have credential it wound be tough.
and if you have already got your Final diploma certificate and sent it to ECFMG..you dont need to worry...
for better understanding of ROL date etc see match timeline