Swift Async call not updating data right away

I am struggling to get the code below to work in my xcode project. The first half of the code doesn't actually populate my code until around the cellforrowat function (not in the snippet below). Because of this the second half of the code snipit doesnt even run (because the movie array is still empty). So I think my problem is that DispatchQueue.main.async {self.tableView.reloadData()} does not update my tableview right away.

var movies: [MovieDT] = []
var db: Firestore
var uid: String = ""

init(genre:Int, categoryNum:[Int], uid:String){
    db = Firestore.firestore()
    super.init(nibName: nil, bundle: nil)
    
    self.uid = uid
    TMDBConfig.apikey = "xxx"
    
    GenresMDB.genre_movies(genreId: categoryNum[genre], include_adult_movies: true, language: "en") { [weak self] apiReturn, movieList in
        guard let self = self else {return}
        
        if let movies = movieList
        {
            for movie in movies
            {
                self.movies.append(MovieDT(title: movie.title ?? "Missing Title", description: movie.overview ?? " ", releaseDate: movie.release_date ?? " ", stars: movie.vote_average ?? 0, id: movie.id ?? 0))
            }
        }
        DispatchQueue.main.async {
            self.tableView.reloadData()
        }
    }
    
    //****************************************************************
    //code below does not work because the movies aren't generated yet
    //****************************************************************
    
    for movie in self.movies
    {
        self.db.collection("Movies").document(String(movie.id)).getDocument() { [weak self] (querySnapshot, err) in
        guard let self = self else {return}
            if let err = err {
                    print("Error getting documents: \(err)")
                } else {
                    guard let snap = querySnapshot else {return}
                    let data = snap.data()
                    print(data?["upvoteCount"] as? Int ?? 0)
                    print(data?["downvoteCount"] as? Int ?? 0)
                    print("jhsjsj")
                }
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        }
    } 
}