De acordo com o perfil de setembro de 2018 da Flying Magazine :
The Denali’s first flight is expected early next year, with an entry into service during the first half of 2020.
Quanto aos números de desempenho que você mencionou, o mesmo artigo diz:
The Denali will weigh less than 12,500 pounds to prevent the need for a type rating, but at the moment, Cessna hasn’t released a gross weight number, nor any performance figures. Those won’t be made public until after the Denali’s first flight next year.