The most likely reason your SSL order is still processing and has not been completed is lack of verification. All SSL orders require verification.
If you chose Email Validation a verification email will be sent out to an email address associated with your domain name, most likely firstname.lastname@example.org.
If you chose TXT Validation you will find the TXT value in the “Open Orders” section of your Dynadot account. Once you have added the TXT record, give it a little time to propagate, then go back to your “Open Orders” section and request verification. If the correct TXT record is found, your SSL order will be validated. Your certificate will then be issued in about an hour.