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as soon as the files are uploaded to the cloud, it should start deleting locally stored images from that folder depending on what you set as preference in Lightroom's preferences. When you first migrate, it will copy over all originals into the folder you found and then upload those to the cloud. When that has happened it will start cleaning up those images. Lightroom CC does not keep originals on your local hard disk, it will store them in the cloud but can keep some local copies for rapid access. This is contrary to the versions of Lightroom you have used before (and that are more full featured) that keep all images locally. That Lightroom has been renamed to Lightroom Classic.
OK, so the solution is just to keep Lightroom CC open while connected to the internet, and as the files upload that cat file will decrease in size. Right?
Yes that's how it is supposed to work