regardless of "process", work items should be tracked (in the problem solving record for our future selves sense, not time keeping sense), so you can follow those. If you're a non-technical manager, then either a) the implementation goes super smoothly and the estimate the dev team initially gave you is all the progress update you need, or b) it doesn't go super-smoothly and you should be involved in any discussions that arise. If you find yourself asking "when is it ready?" you've likely gone astray.