You use heaven-sent to describe something such as an opportunity which is unexpected, but which is very welcome because it occurs at just the right time. It will be a heaven-sent opportunity to prove himself. happening fortunately at exactly the right time
peculiarly fortunate or appropriate; as if by divine intervention; "a heaven-sent rain saved the crops"; "a providential recovery
well-timed, opportune; happening at a very helpful time, arriving just at the right time to help a person