[Django]-Django query: How to filter objects by todays day, time and after 30 minutes?

You have used used TimeField in your model declaration. That stores only the time with no data for day, month or year.

A time, represented in Python by a datetime.time instance

So instead of using datetime.now() use datetime.now().time() and instead of datetime.now() + timedelta(minutes=30) use (datetime.now() + timedelta(minutes=30)).time()

To be able to include filtering by day, month, year and time replace TimeField in the model with DateTimeField. The filtering using datetime.now() and the timedelta(minutes=30) will work as in your original question.