How can you split the the values from getDisplayValues() so that it appears with spaces instead of commas in the textbox popup?

I’d like to have valuesToCopy be separated by a space where the commas are created by getDisplayValues() in the popup so it doesn’t appear as one long string. I’m using getDisplayValues() because there are dates that I don’t want to change the formatting for.

function TextBox() {
  var ui = SpreadsheetApp.getUi();
  const sheet = SpreadsheetApp.openById('1JZ-v5n5m0_lyaoLgsHDAa78AtYNP5AsUDo2NRpJbwG4').getSheetByName('HOT WARM CLIENTS');
  sheet.sort(9)
  var today = Utilities.formatDate(new Date(), "GMT+1", "MM/dd/yy")
  var ui = SpreadsheetApp.getUi();
  var valuesToCopy = sheet.getRange("D5:J5").getDisplayValues()

var ar2 = [
{
  message: valuesToCopy + "\n\n Did we do work for this client today/yesterday?",
  range: "G5"
}

];

ar2.forEach(({message, range }) => {
  var res = ui.prompt(message, ui.ButtonSet.YES_NO);
  if (res.getSelectedButton() == ui.Button.YES) {
    sheet.getRange(range).setValue(res.getResponseText());
    SpreadsheetApp.getUi();
  } else { 
    Logger.log('The user clicked "No" or the dialog\'s close button.');
  }
})

I’ve tried

valuesToCopy = valuesToCopy.split(',') 
and I get an error: TypeError: valuesToCopy.split is not a function

>Solution :

var valuesToCopy = sheet.getRange("D5:J5").getDisplayValues().map(r => r.join(' '));