Function returning map before foreach ended

I have this little program that calculates totals by multiplying a rate and some hours.

The problem I am having is that the function getTasks() always return an empty map. When I log the fields being entered in the map, they are not empty but they are entered after the function returns the map. So I am a bit confused why this is happening.

function getTask(taskId) {
  return rp({
    uri: `${url}/tasks/${taskId}`,
    auth: {
      user: 'user',
      password,
      sendImmediately: false
    },
    json: true
  }).then((task) => {
    return task;
  });
}

function getTasks(entries) {
  const taskIds = [];

  entries.forEach((entry) => {
    const taskId = entry.day_entry.task_id;
    if (!taskIds.includes(taskId)) {
      taskIds.push(taskId);
    }
  });

  const taskRateMap = new Map();

  taskIds.forEach((taskId) => {
    return Promise.resolve(getTask(taskId)).then((res) => {
      if (res.task.id === taskId) {
        taskRateMap.set(taskId, res.task.default_hourly_rate);
        console.log(taskRateMap);
      }
    });
  });
  return taskRateMap;
}

function calculateTasksTotals(id) {
  return co(function* calculateTotalsGen() {
    let total = 0;

    const entries = yield getEntriesForProject(id);

    const tasks = getTasks(entries);

    entries.forEach((entry) => {
      const rate = tasks.get(entry.day_entry.task_id);
      total += rate * entry.day_entry.hours;
    });
    return total;
  });
}

calculateTasksTotals(id)

via willemH