You can create an EE profile, but you'd have to give random scores for the language tests since you don't have the official ones yet and no official ECA number yet. If your CRS is high enough, you'll get an invitation to apply and you will not be able to change your language test scores and they'll find out your ECA isn't completed yet. You risk getting a ban for 5 years, so I'd wait for your language tests and degree evaluation...