Don’t bees do the pollination?
Yes, bees are a good pollinator. But so are the wind and birds and other flying insects. They’re all pollen “carriers.” And if you’re REALLY obsessed with breeding your fruit, you can take a Q-tip and...well, it’s not something to discuss in Polite Company. ;)
BUT...with Cherries and Pears and Apples and a few other fruit trees you need to have another tree of a DIFFERENT variety in the immediate area so cross-pollination can happen.
Compare having no other variant tree in the area to kissing your First Cousin...
...never a good idea, LOL!