You do not need to send any photocopies of passports. Have you completed the online joiners form from the Emirates website in the Selected candidates section?
You will need photocopies to take with you to Dubai of passports and birth certificates, marriage certificates for parents etc, so get them done in advanced if you need to. So you don't forget anything last minute and no need to panic then.
I am sure you will get your Final Approvals very soon (make sure you ring them
)