Outcomes for normal sky blue/opaline & rp cock bird x normal light green/rp hen
100% of the chicks will be light green split to blue.
If the hen is split to blue, then 50% will be light green split to blue and 50% will be sky blue.
25% will be normal, 50% will be normal split to recessive pied, and 25% will be recessive pied.
50% of the male chicks will be normal and 50% will be normal split to opaline.
50% of the female chicks will be normal and 50% will be opaline.
Since I'm not a breeder -- I've only bred my budgies casually a few times -- all I can tell you is your first chick will be light green due to yellow pinnies.
series recessive pied chicks all had white down; I've never bred any green budgies.
I'm interested to read what the experts say!