In the Photo Mechanic toolbar, click the zero-star button to deselect it — so only rated photos are shown in the browser.
Press Ctrl + A to select all visible rated photos. Then press Ctrl + Y to copy selected photos.
In the Browse For Folder dialog, find the "picks" subfolder for the current shoot. Select it and click OK.
Verify the field after + reads {folder}. Click Copy.
Open the picks folder. Confirm the image count matches the rated photo count from the full folder. If they differ, delete the picks and redo.