When bulking do you need to be at a constant surplus or just a daily surplus?

To gain weight during a bulk, it's important to maintain a consistent caloric surplus over time, typically around 250-500 calories above your maintenance level. While hitting a daily surplus is important, it's the cumulative effect over time that will lead to weight gain. I hope my answer help you little bit.
Feel free to ask again if you have any other question.

Thanks brother for sharing your view on this 🙏