async function delayedLog() {
  MongoClient.connect(url, async function(err, db) {
    if (err) throw err;
    let dbo = db.db("mydb");

    result1 = await dbo
      .collection("customers")
      .find(
        { "OrdersMenuInHousing.OrdersMenuInClassroom":
          "OrdersMenuInHousing.OrdersMenuInClassroom.OrdersMenuInDateOrder.OrdersMenuInCostCategory.OrderMenusInAgeCategory.OrderMenusInRelief.MenusInOrder.AccountNumber": 120
        }
      .toArray(async function(err, result) {
        if (err) throw err;
        await console.log(result);
        await db.close();
        return result;
      });
    await console.log(result1);
  });
}

async function processArray() {
  query2 = await delayedLog();
  await console.log(query2);
  console.log("Done!");
}

processArray();