Setting a cell to blink onEdit in google apps script

Question

I'm looking to get this running but am having issues getting the if statements right. The aim is to have the function check a cell value against another and 'blink' the cell background if true to draw the user's eye to that cell.

function onEdit(e) {
 if (e.range.columnStart !=1 || e.value != "TRUE") return;
 const rData = e.source.getActiveSheet().getRange(e.range.rowStart,1,1,25).getValues()
 
 let status = rData[0][1];
 let name = rData[0][4];
 let calls = rData[0][24];
 if (status == "TRUE" || name == calls){
   var number = 50; // Number of blink
   for (var i = 0; i <= number * 2; i++) {
     if (i % 2 == 0) {
       var color = "white";
     } else {
       var color = "red";
     }
     e.range.setBackground(color);
     SpreadsheetApp.flush();
     Utilities.sleep(1000); // Blink speed (ms)
   }
   e.range.setBackground("white") // Cell color is white after blinks were completed.
 }
 

}

all help appreciated :)