you get a gift. you thank the giver. a bouquet of roses. a steak (or veggie burger) dinner.
when do you thank? when you get it. or when you finish it. or both.
you finished that large container of orange juice or coffee or olive oil. personally, I think it’s proper to thank Hash-m – we ate, we were satiated – and finished the bottle or container.
G-d doesn’t need our appreciation.
we gain by appreciation. being grateful gives us more meaningful existence and gives us a feeling of being connected to a kind giver. Our Father in heaven cares.