When you register via MYWRU, you will be sent a link withing 2 hours to complete a DBS check (if you need one).
Please follow the steps in that email.
Once your DBS is sent to the Disclosure and Barring Service, most DBS come back fairly quickly, around 4 days.
However, in a few instances it can take up to 90 days for a check to return.
Your CSO will have access to your application and progress at all times. So please check with them on the status of your DBS check should you wish to.