IMO, if you did not submit the PCC, your application is not completed. Maybe better to call them and ask what should you do in this case.
This is what I found in Document checklist for PCC. I applied without PCC but explained the situation in a separate letter stating I will be sending it soon.
Police Certificates and Clearances
You must get a police certificate from each country or territory where you have lived for six or more months in a
row since the age of 18. You are strongly encouraged to submit your police certificates with your application to the
CIO. If you are unable to obtain all the necessary police certificates, you may still send your application to the CIO
without them. However, we strongly recommend that you take steps to obtain your police certificates now to avoid
future delays. You must be ready to submit them when requested by an officer