Hi there! Thanks for posting and including a picture, it's really helpful.

You're right, that central leader is quite tall compared to the rest of the tree, so it makes sense that you would like to prune it back to reduce the height.

To give you the most specific advice on pruning, though, it would be helpful to know a couple things:

* Is your cherry tree an ornamental variety, or is it meant to produce fruit? Pruning techniques can differ slightly between the two.

* Do you have a particular shape or height in mind for your tree? Knowing your goals will help us recommend the best timing and methods for pruning to get you there.

With a little more info, we can provide some tailored guidance to help your cherry tree thrive. 

Sweet cherry trees can be susceptible to bacterial infections so they are typically pruned later in the summer  when the risk of bacterial infection is lower. Pruning at this time, will also help control vigorous regrowth. Please note: This is different from many othe varieties of fruiting trees, which are usually pruned in winter or early spring.

There's a helpful guide here:on pruning fruit trees that explains pruning methods with illustrations as well as some of the terminology used and tools needed.  https://extension.oregonstate.edu/sites/default/files/catalog/auto/PNW400.pdf

The pruning system best suited to most stone fruit trees is called “open center.” Pruning and training the trees to this system produces a vase-shaped tree.
Open center trees maximize air circulation and light penetration into the canopy center, both important factors in reducing the development of rot on fruit.
The open center pruning system also keeps the fruit-bearing limbs closer to the ground, accessible for pruning and harvest.

Figure 5 on page 4 of the linked guide has some illustrated guidance on pruning an open center. Please reach back out if you have additional questions, and we'll be happy to provide further guidance.