If I get my permit when I'm 18 when can I get my actual license? I'm from california btw?

"At this point—and once you pass your written test— the California DMV will issue you a learner's permit (if applicable). Use this permit to practice for your driving test. You must practice with a licensed driver who holds the same class of license and is at least 18 years old.
There is no minimum time you must hold the learner's permit. If you think you're ready, you can schedule a driving test as early as the next day."