Could you give the geographical location, please? And an in focus close-up of fruit, bark and leaf. And can you describe the flowers? Perhaps Prunus serotina but info needed for certitude.

Floral, most people don't tell us where they are located. Maybe they are afraid we will be coming over for dinner. Yeah, location matters as an important potential clue in botanical identification, dinner plans aside.

I'm in zone 8b Southeast Coastal Georgia. I don't remember seeing any flowers on the tree.

Well if it has all that fruit there must have been flowers, and a lot of them.

Here are a couple of close-ups.

There may have been flowers; we just have never seen them.

I'm assuming this is the same tree as the one in your post from 6 months ago. Still looks like Prunus serotina to me.

https://www.houzz.com/discussions/6203154/please-name-this-tree

I've been looking at black cherry trees online, and the leaves look the same, but the bark looks different. The bark on my neighbor's tree is somewhat reddish while the black cherry tree looks a darker gray. I live right next door to my neighbor and I have never seen flowers on this tree, even though the berries usually follow the flowers. I'll ask my neighbor if they've seen flowers on it. The black cherry tree on line looks like it grows tall and thin and this one is very symetrical and almost as wide as it is tall. If it it black cherry, would the fruit be edible?

Berries always follow flowers, so it must have had them.

The sideways lines (called lenticils) on the bark indicate that is a cherry. It could be a black cherry, Prunus serotina, or a chokecherry, Prunus virginiana. Both have relatively long, narrow clusters of flowers and fruit as in your photo. IME P. virginiana tends to have redder bark and is a shorter tree. Either of these two cherries will have fruit like yours, mostly pit with a thin layer of very tart flesh. While technically edible, they are not particularly appealing, even for someone like me who enjoys tart cherries.

The flowers are a creamy white and faily small, and in my spring weather may only last for a few days, so you may not have noticed them, but as others have said, fruit only forms after the plant has flowered. They are both native and are good food sources for birds, pollinators, and other wildlife.

Prunus caroliniana if it's evergreen