Scheduling is for refreshing the report automatically at a pre-specified time. It also allows you to send the report as email attachment or store the report in a file server automatically once the report is refreshed. The Job server controls the triggering refresh of a report at specific time and sending the report instance to specified location. The refresh part is however done by webi processing server - this is the same as manually refreshing the report.
If you schedule the report to run on Wednesday and separately refresh the report manually at the same time, the data returned will be same in both cases - as the data fetch part is same in both scenarios.