Go to Options->Log Settings and here you are able top configure alerts for when tasks complete, fail in error or have warnings.
I don't think you can communicate the folder where the reports are saved as part of this configuration, but you can create a simple task with only that email address as the recipient, and an email that contains the path for the folder where the reports are saved.
Then run that task last as part of the job that contains the actual report task.
In addition to what Stephen states, you can also build a conditional report that compares todays date to the reload date - when they are equal you know the reload completed and the report can be sent. Conversly you can have another report for the opposite to let someone know the reload failed
an assumption is the reports are scheduled to run at a time where the reload should be complete