There is no single right moment that applies to everyone. The product is described as practical after the gym, after a long active day, or whenever a meal is low in protein and needs an easy addition. So the most useful approach is to fit it into the meal or snack where protein is missing.
Practical ways to use it include blending it into a smoothie, stirring it into porridge, mixing it with yoghurt, or shaking it with liquid for a quick post-workout shake. Because this is a protein powder rather than a complete meal replacement, it works best as an addition to a varied diet and not as a replacement for whole foods.
Since the formula contains fibre from chicory root inulin and active extras such as maca, starting with a smaller portion than you would with a plain protein powder is wise if you are not used to this type of product. You can gradually increase the amount once you know how it sits with you. Plant proteins also sometimes need a little more shaking or blending to mix smoothly, so using a shaker or blender is usually more practical than stirring with a spoon.
If you train, the added BCAAs in the formula are a relevant feature because they are involved in muscle protein synthesis and recovery after exercise. But the practical benefit still depends on your overall daily protein intake, not just on when you drink the shake. If you are pregnant, breastfeeding, have a sensitive stomach, or follow a specific eating plan, it is sensible to check with a specialist before adding a new supplement.