Check the selection in the gallery
The numbers under the stage bar show how many photos your client selected (and, if you set a limit, how many go over it), how many you recommended, and how many your client marked as favorites or rejected. Selected photos have a green check mark on the thumbnail.

Download the Lightroom list (recommended)
The Lightroom list (TXT) button under the stage bar downloads the names of the selected files. Paste them into the text filter in the Lightroom Library (Text, Filename, Contains), and Lightroom shows exactly those photos from your RAW catalog.
Or download a ZIP file
The main button in the top right corner of the card, Download selected photos (ZIP), packs working copies without a watermark. These are the files stored in the selection gallery, resized to 2560 px on the long edge. They're useful for previews and approval, but not for final editing. If your client selected paid extra photos beyond the package, the ZIP unlocks only after the extras are paid.
Picvelo packs the photos your client selected into a ZIP archive with the original files.