Hi Mihai,
i don't think you have to wait.
Sun must give you a voucher in order to allow you to take the SCWCD exam.
And if you check Sun website, you'll see they already know you passed.
(i passed
SCJP 5 last friday (02/10/2006) and today i saw on sun's website in my history that they know i passed.
So no need to wait certificate.