Count unreviewed records and visualize as progress bar

I have a table where my team reviews the data, at each save, the username and timestamp is recorded to the table. I want to visualize progress of review via progress bar. Im trying to find how many records are completed by counting the non-empty cells in the reviewed column.

Then in progress bar, set the value to something like below

parseInt(count-of-non-empty-cells-in table1) / 
parseInt(table1.displayedData.length) * 100

How do I get the first value?

Take a look at the javascript filter function - eg => x.sales).length
"get a count of the table1 data array where sales exists"

Sweet! Thanks!