No worries. Pooping once a day can be very normal.
Ellie usually only goes once. It has been like that for a few years. I recently increased her calories and she goes once or twice now.
She used to eat about 1/2 cup of dog food and she eats right around 3/4 cup homecooked. Her diet is around 18% fat. If I didn't add oil she would probably need a larger amount of food.