Hi Shimank
This can be archived by enhancing status profile program of delivery and activate PPF action to send update as per change in status of del.
you can use standard program for same.
flow will be as you create del and passed in ewm ... status profile program will use action to send updated status to ecc. and then you have to update status of OvrllPickStatus in ecc.
changeling part will be how this will impact ecc as there is now WM activity for ECC.
Regards
Suraj