How do I bring the number and element of an array in order? Example 1.Bill, 2.Jane, 3.Ann?

Build a function currentLine that accepts the current line of people and returns the current line as a string; for example, if 'katzDeliLine' is currently ["Ada", "Grace"], currentLine(katzDeliLine) would return "The line is currently: 1. Ada, 2. Grace". You don't have to use katzDeliLine as a variable or parameter name in your function though, it's just an example of a variable that might be passed to it. If there is nobody in line, it should return "The line is currently empty."

I have tried quite a few different codes and have been experimenting for a while...

function currentLine(line) {

  if (line.length > 0)

  return `The line is currently ${line}.`;
  else {
    return 'The line is currently empty.';
  }
}

1) deli currentLine(line) says who is in line when there are people waiting:

Error: Expected 'The line is currently Bill,Jane,Ann.' 
to equal 
'The line is currently: 1. Bill, 2. Jane, 3. Ann'

+ expected - actual

      -The line is currently Bill,Jane,Ann.
      +The line is currently: 1. Bill, 2. Jane, 3. Ann