There is a built in report in LDMS 9.0 SP3 (in prior) that you can run against your tasks and report on the status of your devices in those tasks. This report is called "Software distribution delivery status by task" and can be found in the Reports module in All Reports or Standard Reports | Distribution Status.
However, this report runs against all of your tasks that correspond to your selection. It does not allow you to select a specific task and report against this one.
The attached report allows you to select a task from the list of all your tasks, and lists status per device in that selected task.
Community Reporting articles