Yes, you can publish OTA updates via
expo publish to make pure JS changes to your app without having to upload to the app store. There are some limitations though.
You can check for updates by adding a listener or using the provided methods to the
Updates module. You can read about these here.
I’d strongly recommend reading and searching our documentation before asking questions as all of these answers can be found in them. Doing so will allow you to get your answers faster and get back to building your project rather than having to wait for someone! It’s a great practice to get in the habit of.