Supervising a manufacturing process includes attending to the individual phases of the production.  Also, manufacturing supervisor should have a close eye on the inventory that going to be used.
Step 1:  Keep the records of different phases of manufacturing also analyse whether the amount of product produced by the crew is enough to meet the demand
Step 2:  Look for the bottlenecks in the unit and see how you can eliminate it
Step 3: Keep the track of inventory and try to reduce the liquid capital used after unused material
Step 4: Examine the final goods to determine whether they meet the company’s quality standards.   _{Your Comment}