Yes, you can find the boarding group infomation on the Walt Disney World website. On the plan your visit to Galaxy's Edge pageRead my whole post. Not everyone uses the app months before their vacation. You cannot find this information using the website. Not only that, I know that some Asian versions of the app do not have capability to join a boarding group. I know this because I worked virtual queue.
I agree with the usage of virtual queue regarding capacity. My only opinion is that Disney screwed up and opened the ride early.