Background Removal to White

I need the existing background removed from my photo(s) and replaced with a clean, solid white backdrop. The subject must remain sharp with smooth, natural-looking edges—no color fringing or haloing. Please deliver the final image(s) in high-resolution PNG (transparent layer preserved) and JPEG with the white background applied. Keep lighting and any natural shadows intact so the result looks realistic. Let me know how many files you can handle and your expected turnaround time.