PickReleased & Picked timestamp

Hi,

I need to capture a timestamp start from when user create delivery schedule detail from Sales order then it will show on open pickmanager, user create Release to Pick and user Picked a picklist. How to do this ?

Any suggestion ? may be i've use UDF and SBO_Notif ?

It seem SAP capture the data from OSLD then insert it into OPKL-PKL1-PKL2

I need to measure the time process from delivery schedule details - PickList - Picked - Delivery Order.

I am on B1 9.0 PL14

Thanks