Before officially reporting for duty, the company provides an opportunity to attend as an intern. If interested, you can first experience the workplace atmosphere and job responsibilities. It is intended to help job seekers assess whether they want to join, which is quite a considerate approach and avoids hiring people hastily.
So far, I think it is fine. At most, everyone may be quite busy because there are many customer orders, so you do need to work proactively and diligently.