Once you've signed up for the TuneCore YouTube Sound Recording Revenue collection service it can take a week for tracks to be properly ingested and delivered to YouTube for monetization. However, it can take additional time for YouTube's Content ID Match to find all the videos across the platform which are using your sound recordings. This process can take even longer for older videos (it will first scan new videos and the most popular videos). Now that your tracks are in the system though, if a new video is created containing your sound recording, the match should be instantaneous.
You can check the delivery status of your track/s on your YouTube Dashboard by clicking on Manage Tracks .