Yeah, wait for the endorsement letter from IRCC as the Pak Embassy will ask for it while preparing the request letter. So once you reach to them, they will provide you the necessary request letter addressing to the KSA govt. Take an appointment from Absher for the Police station. for Eastern province, only Dammam has the facility to provide the PCC. It will take you max 10 mins to get the PCC.
Then, take appointment for MOFA from Absher or MoFA website to get your PCC attested. Get this translated and go to Chamber of Commerce, which is just beside Mofa where they will verify the translator's record and stamp it. Take appointment of same day for MOFA and take this attested document to MOFA for attestation on translated document. thats it!
Just remember, you will always have to take appointments for your visits to MOFA or Police Centers. CoC is walk through service!