I would use WP All Import Pro (WPAI) and both the WC and ACF add ons
Importing that amount of data is going to take a while.
The first think I’d do it to chunk up the import and do several instead of trying to get it all done at once. I have successfully imported several thousand products into sites using these tools, but I’ve never done the number you’re looking at. I would think that the size of the file upload to begin the import would be a significant hurdle. Like I said, I would chunk it up, so many imports, and plan on spending some time working on it. Good thing about WPAI is that you can start an import running and go do other things, you just need to leave the browser window open.
