He was good enough to take on
SL A-team year and a half ago which included a mix of veteran and upcoming Lankan players(who currently plays for SL national team). IMO, by now he is good enough to take on visiting Zim team, at the ODI series in Sylhet.
It's prolly won't be wise to rush him into Test or T20I side at this point, given his lack of experience in those two formats. But it's time to start grooming him through upcoming ODIs against Zim and Ireland.