When are user permissions ready? - trying to assign permission in post-migration signal

Fairly new to django so there must be a lot I have no idea about.

How can I assign user related permissions to user groups in a post migration signal?

I have read everywhere that post migration signal can work which actually does... to an extent. I can create the required user groups and assign permissions to them but the ones related to user model. E.g. view_user, create_user, change_user are not ready to be assigned in post migration.

Im not sure of all the options I have here but already tried to define a migration file and nitpicking sender does not look like a way forward either.

Signal handler:

@receiver(post_migrate)
def create_groups_and_assign_permissions(sender, **kwargs):

    print(f"sender: {sender}")

    # Only run after auth migrations
    if sender.label != "auth":
        return

    for (code_name, name), permission_codenames in GROUPS_AND_PERMISSIONS.items():
        group, _ = Group.objects.get_or_create(name=name)
        GroupMetadata.objects.get_or_create(
            group=group, code_name=code_name, display_name=name
        )

        for codename in permission_codenames:
            try:
                perm = Permission.objects.get(codename=codename)
                group.permissions.add(perm)
            except Permission.DoesNotExist:
                print(f"[WARNING] Permission '{codename}' does not exist yet")

Singal is imported in the AppConfig:

from django.apps import AppConfig


class UserGroupsConfig(AppConfig):
    default_auto_field = "django.db.models.BigAutoField"
    name = "apps.users.features.user_groups"

    def ready(self):
        # Register signals
        import apps.users.features.user_groups.signals  # pylint: disable=unused-import, import-outside-toplevel

GROUPS_AND_PERMISSIONS constants:

GROUPS_AND_PERMISSIONS = {
    ("manager", "Manager"): [
        ...
        "add_profile",
        "change_profile",
        "view_profile",
        "add_user",
        "change_user",
        "view_user",
        "view_groupmetadata",
        "view_group",
        ...
    ],
    ... other roles ...

Output:

Running migrations:
  No migrations to apply.
sender: <AdminConfig: admin>
sender: <AuthConfig: auth>
[WARNING] Permission 'add_user' does not exist yet
[WARNING] Permission 'change_user' does not exist yet
[WARNING] Permission 'view_user' does not exist yet
sender: <ContentTypesConfig: contenttypes>
sender: <SessionsConfig: sessions>
sender: <UsersConfig: users>
sender: <ProfilesConfig: profiles>
sender: <UserGroupsConfig: user_groups>
sender: <StoragesConfig: storages>
sender: <PdfExportsConfig: pdf_exports>
...

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