@Thamuk Congratulations on obtaining your CISSP! Your certificate is processed and shipped based on your cycle start date and can take up to 12 weeks (if being shipped overseas) to be received from that date. If you would like me to check your dates and postal address, please feel free to email me at firstname.lastname@example.org.
Depending on your need, self-printable certificates are downloadable from the member-home page (select "digital certificates" from the members menu) and you can validate to an employer that you have the credential by using a Digital Badge or the Certificate Verification site.
The only real value to the mailed Certificate is to have something nice to hang on your wall, which I do agree is important.