Let me assume that you are already parsing XLS 1,2 and 3, and you need to make it *also* process 4,5 and 6. Point 1 refers to the output (SKU, PRICE) from the current conversion process.
I'm not exactly sure what point 3 refers to, do you want a progressbar? I think it superfluous unless you are uploading a zip file with 10/100 of these in one go (did I say zip? I'm expecting one .xls file per upload). The conversion will be over within seconds of uploading the file.
Re point 4, does this simply go back to a fixed page (dashboard)?
Clarifications aside, I've bid what I think is roughly the effort for this job.