Recovery of deleted photos.

"Deleted"? What were the exact sequence of steps (in detail, please)? Were these steps done in Lightroom Classic or in your operating system, or somewhere else?

deleted photos from one of my collections

Do you mean:

• Removed from Collection

or

• Removed from Catalog

or

• Removed from Catalog and deleted from disk?

Three very different scenarios

https://helpx.adobe.com/lightroom-classic/help/photos.html

If you simply deleted the collection, that only removed the collection from the catalog. However, the images should still be in their folders. A collection is simply an organization of images within the catalog. It does not physically move images. A collection can be an organization of images from multiple folders. But it does not move the images from those folders. It simply creates a reference to those images and organizes the images in a group within the catalog. So unless you went to the folders and delete the images they should still be in their original location.

If you did in fact delete the photos you should be able to find them in the trash or the recycle bin, depending on your operating system. But in that case it will be necessary to edit them again because all of the editing will have been discarded from the catalog.