Hi mmg. Are you proposing to apply for the NCEES 8hr and the CA exams separately because you prefer to take them during separate administrations, or for another reason? It's not typical but it is also not unheard of that an applicant can apply for/take/pass all three exams in one administration (or two out of three). I passed one at a time in three consecutive administrations... what is your plan? I believe you apply for all three exams with the same application. Curios why you are separating them?
After you pass the take-home exam, 8 hr, CA surv/seis, any other requirements, and are notified, you'll see your name in the state's PE License look-up database, typically same week or next, and that is when you are officially a PE.
Good luck.