Background Removed, Transparent Product PNGs

I have a set of product photos saved as JPEGs. The product itself must stay perfectly sharp and fully opaque, but every bit of background around it has to disappear so the file can be used on any coloured layout. Please remove all traces of the background, tidy any rough edges or stray pixels, and deliver each file back to me as a high-resolution PNG with a transparent layer. Keep original proportions and resolution; no cropping unless a border is visible after the cleanup. Color, lighting and product details must remain untouched. Once complete, send the ready-to-use PNGs plus the layered source file you worked on (PSD or equivalent) so I can make any future tweaks if needed. A quick turnaround is appreciated—let me know how many images you can process per day and I’ll supply them right away.