With Cryo Pods easy to obtain, you can raise a wyvern whenever you want. If you want to get 100% imprinting and its getting late, you can freeze the young wyvern when you go offline to stop it growing and starving to death. The best way to get eggs is to play on Ragnarok and either use a Griffin or pteranodon to get the eggs.

More Wyvern Taming & KO Tips