A more important question is, will your site be ready? There are a lot of concerns over this latest WordPress upgrade that will incorporate a page builder style editor for adding posts and pages. Some people are worried about backward compatibility. Others are imploring WordPress to make this as a plugin instead of a core WordPress feature. Although Gutenberg will be built into WordPress and the default editor in a forthcoming release, you can download a plugin that shows you what it does and how it works. Unfortunately, the plugin has had mixed reviews, mostly very low:
I have been playing around with Gutenberg and find it really buggy, so hopefully it is still a long way off. There were rumours that WordPress were going to add a link to “Try Gutenberg” to the current or next version of WordPress, but based on my own experiences, feedback and reviews so far, I hope they push it back until it really is ready and battle tested.
To help you make sense of all this, I recorded a video that shows the basic use of Gutenberg, plus how you will be able to disable it when WordPress do force it on you.