Why function on ng-checked is not getting called

I have called a function on ng-checked and through that function it is getting decided whether checkbox will be checked or not. But the function is not getting called at the load of page.

html –

<label>
     <input type="checkbox" name="status1" id="status1" ng-click="vm.updateStatus('processing')" ng-checked="vm.isSelectedStatus('processing')"> In progress
</label>

JS(controller) –

var vm = this;
vm.isSelectedStatus = isSelectedStatus;

vm.tasksStatus = ["processing", "finished", "failed"];

function isSelectedStatus(status) {
  return vm.tasksStatus.indexOf(status) > -1;
}

function updateStatus(status) {
        var index;

        index = vm.tasksStatus.indexOf(status);

        if(index === -1) {
            vm.tasksStatus.push(status);
        } else {
            vm.tasksStatus.splice(index, 1)   
        }
    }

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/10/why-function-on-ng-checked-is-not-getting-called/
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