Indeed, one may think that it is preferable to take collagen in the evening so as to favour its use during the nightly synthesis of proteins, particularly those of the skin.
However, many studies that have shown good results have shown that collagen should be taken in the morning. In fact, this is explained by the fact that the dose of 10g/day allows the natural synthesis of collagen to be restarted by the different cells of the body (chondrocytes in the joints, osteoblasts in the bones, fibroblasts in the skin). So it is not so much the quantity of 10 g taken or the moment of taking it that is important, but the fact that it stimulates the production of endogenous collagen. So you will observe just as many results if you take the collagen in the morning.
On the other hand, taking it at the beginning of a meal (breakfast or dinner) allows a better assimilation, especially if the meal is a bit heavy and fatty.