LWC- Sort Records Returned By Wire Service To Be Used By Child Components

Controller

public with sharing class ATLController {
    @AuraEnabled(Cacheable=true)
    public static List<Task> getTasks(String recordId) {
        return [SELECT Id, Subject, TaskSubtype, ActivityDate FROM Task WHERE WhatId = :recordId];
    }
}

JS

import { LightningElement, api, wire } from 'lwc';
export default class AtlBase extends LightningElement {
    @api recordId;
    completedTaskList = [];
    upcomingTaskList = [];
    @wire(getTasks, {recordId:'$recordId'}) 
        tasks; 
        for(let task in tasks){
            if(task.Status === 'Completed'){
                completedTaskList.push(task);
            } else if(task.Status != 'Completed'){
                upcomingTaskList.push(task);
            }
        }
}