To Delete or Not to Delete Photos Library
Up until several days ago, I would use my iPhoto app on a 2008 Mac Pro running El Capitan to update and use my pictures library. Sadly, my Mac Pro is now RIP. Fortunately I kept an up to date backup on both an external hd AND iCloud. As much as I tried moving that library to a new 2019 MacBook Pro with it's Photos app, the import never went well, so I just gave up and decided to move them to iCloud. Photos app on MBP right now is set to sync with iCloud BUT, optimizing Mac Storage, so in theory I do not have the originals on my MBP as I did on my 2008 MP.
However in my MBP I do have 2 "Photos Library.photoslibrary" in my Pictures folder. One is 428gb (inside a subfolder within Pictures and the other is just 34gb on the Pictures folder (says updated today too). I assume the former is when I tried to import them from 2008 MP to the MBP. The latter I assume is my actual library.
When I open the MBP Photos app I assume it is getting the info from iCloud and it is not using either of those libraries.
So, what I want to do is download all originals from iCloud into the MBP, AFTER I delete both of those libraries and start from scratch. And by delete I mean simply selecting those 2 libraries and dragging them to the trash.
I'm I right in thinking that by doing this, first, my iCloud photos will not be deleted, and secondly, Photos app will create a new library from scratch with the downloaded originals?
Or is there a better way for me to do this?
Thank you for any help I can get.