How can tooltips be displayed in progress bars of Highcharts?

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Tooltips can be displayed in progress bars of Highcharts using the following steps:

1. Set the tooltip property of the chart to true to enable tooltips.
2. Set the formatter property of the tooltip to a function to customize the tooltip content.
3. In the function, use the this.point object to access the data point associated with the progress bar and display the desired information.
4. Set the pointFormat property of the tooltip to format the tooltip content.

Here is an example code snippet:

Highcharts.chart('container', {
  chart: {
    type: 'bar'
  },
  title: {
    text: 'Progress bars with tooltips'
  },
  yAxis: {
    min: 0,
    max: 100,
    title: {
      text: 'Percentage'
    }
  },
  series: [{
    name: 'Progress',
    data: [75, 40, 60],
    tooltip: {
      enabled: true,
      pointFormat: '{point.y}%'
    }
  }],
  tooltip: {
    formatter: function() {
      return this.point.y + '% complete';
    }
  }
});

This will display tooltips when the user hovers over the progress bars, showing the percentage complete.