Visiting family here and a quick trip to Miami - need advice

Will be headed to Miami Friday with my son for the afternoon/evening. Will be checking out Wynwood Walls in the afternoon before dinner downtown. Will be using Tri-rail from Delray. Was thinking of going to Miami central then Uber to Wynwood. But the schedule is not ideal. Either getting there way too early or late. Could we get off at the metrorail transfer station and use Uber to Wynwood? Any other option?

Thanks!