I'm running a bit of a hybrid setup at the moment syncing between my phone and Lightroom Classic on my laptop. My main machine is still my laptop but sometimes if I'm out and about or know I'm going to be away from home for a few days I'll import my raw files to my phone and start editing. I work on Windows machine so some of the terminology given below might be slightly different if you're on a Mac
Make sure you import the raw files into an album on your ipad, this will make the subsequent file move on your laptop much easier. I let the raw files upload from my phone overnight, then the next day open Lightroom Classic on my laptop.
You'll see a section under Collections in Lightroom Classic called "From Lightroom CC". This is where the album you created on your iPad will end up. Let Lightroom Classic download all the raw files, and you'll have an album sitting there with all your edits and everything else carried over. Now, if you want to move the raw files, create a blank folder in your usual folder structure, and add this folder into Classic.
Go back to your collection synced from Lightroom CC, select all the files and drag them to the new folder you just added. This will physically move the raw files on your HDD to the new location. I then create a new collection and re-sync this with Lightroom CC to get the smart previews uploaded into the cloud (as smart previews don't count towards your cloud storage limit). Once you've done all this you should be able to delete the original album from your iPad.
I hope that makes sense. It's quite complicated as CC and Classic aren't technically supposed to work together but it can be done. Also make sure you've got backups of everything before you delete the originals from Lightroom CC on your iPad, just in case it goes wrong!