OSA - check status to sent notification

Hi All,

I have a process flow for appraisal form where Employee ==> appraiser A, Appraiser B ===> Manager. Employee send the form simultaneously to Appraiser A, B. Manager will only access the form when both A, B complete their comments/ratings. Since the form is for A, B to complete without any sequence, how can we check that both A,B have completed the form and send a email to the Manager. Do we need a batch program to check the status or is the status flow functionality is capable of doing the check?

Your advice is very much appreciated.