I would echo that the day after is harder. It was for me.
The day itself is busy, people around you, activities to be done, word to say, tears to keep away at the funeral (I cry lots and so came armed with methods of holding it together)
The day after, everyone seems to have moved on. You wake up and there's nothing there, no plans or busyness, just your grief which hasn't faded but somehow it felt as if the mourning phase was meant to be over and life was back normal. But it wasn't
I was sadder in the days after the funeral than the days before.
It might be very different for you, and there is a relief in the funeral, and it's completion. You might not feel the same way.
I sincerely wish you all the best. It must be terribly hard trying to hold it all together for everyone else. Do take time yourself if you can