I have plenty of vines growing up trees and on the ground. I will show some pictures taken today of vines with mature fruit and vines with new fruit while flowering.
The typical edible portion is under the green outer husk having hexagon and pentagon shapes. it is the white flesh area. The center core is fibrous and you just push your finger or spoon along it to get some unattached for consumption. It is more flavorful than any mango IMO with a banana/pineapple taste. It is very intense and I can enjoy up to one (usually 1/4 of a pod) as too much will will make the mouth and lips feel like you have had acid irritating the mouth.
It's a fun novelty product to show off and sample IMO. But, if your unable to dip your tongue into a rinsed crack of a blackish green fungus skin loaded keitt mango to enjoy its sour/sweet taste... Your probably too squeamish and hesitant to put this off white rotten looking black speckled monster with soft flesh into your mouth.
Ripening can occur outside or inside the house. When picked after it starts turning from green to light yellowish, indoors about 5-7 days wrapped in some paper to contain the shedding outer hexagon husk and fibrous black/green specks.