if a task call with delay() when will execute exactly? - django

Question

I'm new in celery and i want use it but i don't know when i call a task with delay() when exactly will execute? and after adding a new task what i must to do to this task work correctly? i use a present project and i extending it, but old task work correctly and my task doesn't .
present app1/task.py:
from __future__ import absolute_import, unicode_literals
import logging
logger = logging.getLogger('notification')
#shared_task
def send_message_to_users(users, client_type=None, **kwargs):
.
.
#doing something here
.
.
logger.info(
'notification_log',
exc_info=False,
)
)
and this is my code in app2/task.py:
#shared_task
def update_students_done_count(homework_id):
homework_students = HomeworkStudent.objects.filter(homework_id=homework_id)
students_done_count = 0
for homework_student in homework_students:
if homework_student.student_homework_status:
students_done_count += 1
homework = get_object_or_404(HomeWork, homework_id=homework_id)
homework.students_done_count = students_done_count
homework.save()
logger.info(
'update_students_done_count_log : with id {id}'.format(id=task_id),
exc_info=False,
)
sample of how both task calling:
send_message_to_users.delay(users = SomeUserList)
update_students_done_count.delay(homework_id=SomeHomeWorkId)
project/celery.py:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'hamclassy.settings')
app = Celery('hamclassy')
# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
# should have a `CELERY_` prefix.
app.config_from_object('django.conf:settings', namespace='CELERY')
# Load task modules from all registered Django app configs.
app.autodiscover_tasks()
projetc/init.py:
from __future__ import absolute_import, unicode_literals
# This will make sure the app is always imported when
# Django starts so that shared_task will use this app.
from .celery import app as celery_app
__all__ = ['celery_app']
after any change to task i run workers by this command:
celery -A project worker -l info
when i calling update_students_done_count.delay(homework_id=1) in an endpoint the log shown me that recived task but how much i'm waiting the task not execute. any idea?thank you