"Late" mango is, obviously, a flexible term. My Honey Kiss are good to eat now, and July isn't over yet. The summer has been long and hot, and the fruits are ripening just fine. Doubt any will last into September.
Neelam, at least this year, is more of a late-season mango: It's fruits still need a few (2-4) weeks. The Honey Kiss taste is much better and the tree is quite productive; besides, the rains make the Neelam a bit iffy. And Neelam has fiber, which the Honey Kiss doesn't.
Will decide if Neelam (and Nam Doc Mai) should get the ax next month. Hate to cut down a tree, but it's a small yard and space is at a premium. I have had 0% success at grafting, so planting a new tree is the way to go.
Over the past few years, I found I'd rather have a shorter but very tasty mango season than extend it with mediocre mangoes.