Progressbar JS/AJAX during a php loop calculation

I have a [login to view URL] file with a form and after clicking the submit button its redirect to a calc.php. In the calc page is only calculation, no visible content. There is a lot of calculation and a lot of lines writing in the sql database at the end. It may be over 100,000 or a million entries in the end. The calculation is fast, but with such a high number of database entries it will take 5 or 15 seconds. To get informed about the current line and run it would be very helpfull to see the information as number and additional als a progessbar. The progressbar is 100%, means with 10 runs with each 10.000 lines its 100%=100.000. I can imagen the number are increase fast and showed as that information: Line 325/10.000 Run 4 (40.325/100.000)... Or something like that. Attached you see example file of the calculation. There should be no refresh of the page to refresh the numbers and there should be no sleep function or such slowdown. The calculations have to be done quickly, any delay is counterproductive. I just want a visual intermediate result of where I am currently in the calculation. Recommend freelancers with an live example prior the awarding! Please send the link in the chat. No standard freelancer text with portfolio.