I was wondering if in-app rate app pop-up appear for the users already has rated on App Store?
No, the rating prompt shown via SKStoreReviewController.requestReview(in:)
does not show for users who have already given feedback.
From Apple's Human Interface Guidelines (emphasis mine):
When you identify places in your experience where it makes sense to ask for feedback, the system checks for previous feedback and — if there isn’t any — displays an in-app prompt that asks for a rating and an optional written review.