Perhaps based on order cost estimates and actual cost of SO , you would be able to get an idea of the WIP status of each SO .

New View based on  below ,and classify different percentages  0-25% - low  , 25%-50% -medium….

Eg , {(WIP cost + Received cost ) / Total Estimated} %  , SO no 

You could create a lobby based on above new view .

its not something accurate as this is based on total  Estimate cost

You could also use the WIP Build Up value from this overview.  We would use that value divided by the standard cost for most of our product as it is Kanban/Backflush mostly.  But Total Estimated would be good too if more of a custom/one off operation.

Thank you for all your inputs. I believe existing solution may not fully satisfy our requirement. However, my expectation is, IFS should keep the provision for user to define the WIP Level and the criteria.

Example: User may decide it depending on the % operation sequence completion, % qty completion of the operation, % WIP Value, manual preference. This could be implemented in Shop order operation level together with basic data.  

Following shows different WIP Levels Criteria's (Included in a drop down) and Example formulas.