code: def update_band_description(self):
          
          self.clear_further_steps()
          # Set widgets
          selected_band = self.selected_band()
          statistics = self.parent.layer.dataProvider().bandStatistics(
              selected_band,
              QgsRasterBandStats.All,
              self.parent.layer.extent(),
              0)
          band_description = tr(
              'This band contains data from {min_value} to {max_value}').format(
              min_value=statistics.minimumValue,
              max_value=statistics.maximumValue
          )
          self.lblDescribeBandSelector.setText(band_description)
docs: Helper to update band description.