Cut out images from their backgrounds in Photoshop

Hi. I have 2463 images of products. Products are professional images provided by companies. I need to use these for a website. I would like the products to be cut out from their backgrounds (which are often white or grey) using adobe photoshop. Then saved the cutout image into a new folder as a png file (72 dpi resolution or better please). Same file name to be used. Task is to be completed within 3 days from listing acceptance. Small sample of images attached. Images will be sent via dropbox. Thanks for bidding!