High draft picks always get their playing time, especially when they are considered a "generational talent".
Overall, yes, players selected with the first picks in the draft typically receive a lot of minutes in their debut season, but that's not always the case. Take, for example, Kwame Brown, Anthony Bennett, and Markelle Fultz, who were selected with the first draft picks, but in their debut season, they got few minutes and their performances were very poor, which isn't typical for players selected with the first pick in the draft.
It really depends on performance. Maybe they’ll give the player around 5 games to see how effective he is, but if he’s not playing up to expectations, the team won’t force it, even a first pick can end up getting limited minutes. you know, basketball is a team sport, and what matters most is winning. Teams can’t afford to keep giving minutes to someone who isn’t contributing, regardless of draft status. It’s still a gamble when these players enter the NBA, since it’s a whole different level compared to the NCAA or whatever league they came from. But to be fair, most first picks have generally lived up to expectations.