show progress in foreach statement

I'd like to show progress dialog in foreach statement on list value

but not showing progress dialog 
how to show progress dialog in for each loop?

```
listItems.values.forEach((value) {
      EasyLoading.showProgress(idx / listItems.length, status: '${listItems.length}/ ${((idx / supportIndexBox.length) * 100).toStringAsFixed(0)}%');
idx++;

});
```
