A few things I found just googling around:
Emphasis mine.
In Kakko, the Rangers get
the most NHL ready prospect in this year’s draft. - LastWordOnHockey
After his performances in Liiga, the pro league in Finland, and the IIHF world championships, anticipation is high that
Kakko will make an immediate impact for the Rangers as a goal-scoring winger. - ESPN
He has the size, strength and scoring ability to become
an immediate impact player. - Bleacherreport
Chris Peters - ESPNMay 6th: "
An NHL-ready player who has honed his craft against pros, Kakko is good in all areas of the ice with few noticeable weaknesses."
Kaapo Kakko, the No. 2 overall pick by New York back in June, is a main reason why their ranking jumped from No. 11 last season to the top dog now. The Finnish forward was
highly touted as an NHL-ready prospect that should make an immediate impact for the Rangers this season. - SNY
He's a complete package and he's going to have a strong future ahead of him because he's already physically developed and has a couple of years of experience playing at the pro level
so he's as game-ready as you're going to find in this NHL Draft." - NHL.com/devils (pre-draft)
He was surrounded by cameras and peppered with questions, similar to the attention Kakko faced last month at the IIHF World Championships in Slovakia when the 18-year-old from Turku, Finland, solidified himself as
arguably the most NHL-ready player in this year's draft class. - AP/USA today
Anyway these are just a few, you can find a ton of examples.