Apple App Store listing not displaying in AdMob app link search

[Timothy Hutton]

Hello, I am curious about the timeline for linking my Apple App Store listing to my matching AdMob iOS app entry. I have completed review of my app with Apple and I am ready to release it. 4 days have passed since the successful review, but I still cannot get the linkage to work within AdMob despite trying with my developer name, app name, and app ID. 

Is it possible to link the app before it's released so that ads will display? I don't want to release it without making sure that monetization is functioning correctly. Test ads display correctly, but I am yet to see production ads populating within the app.