Firebase data not displaying in tableview

I am trying to retrieve information stored in a Firebase Database, but my tableview is not displaying the information as it shows up blank when I run the simulation.

I am using Xcode 11 and I have been stuck on this issue for quite a while so any help would be much appreciated.

Here is my code:

Code Block 
import UIKit
import Firebase
import FirebaseDatabase
import SwiftKeychainWrapper
import FirebaseAuth
class FeedVC: UITableViewController{
   
  var currentUserImageUrl: String!
  var posts = [postStruct]()
  var selectedPost: Post!
   
  override func viewDidLoad() {
    super.viewDidLoad()
    getUsersData()
    getPosts()
    // Do any additional setup after loading the view.
    tableView.register(PostCell.self, forCellReuseIdentifier: "PostCell")
  }
  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }
   
   
  func getUsersData(){
    guard let userID = Auth.auth().currentUser?.uid else { return }
    Database.database().reference().child("users").child(userID).observeSingleEvent(of: .value) { (snapshot) in
      if let postDict = snapshot.value as? [String : AnyObject] {
        self.tableView.reloadData()
      }
    }
  }
   
  struct postStruct {
    let firstName : String!
    let lastName : String!
  }
   
  func getPosts() {
    let databaseRef = Database.database().reference()
    databaseRef.child("profiles").queryOrderedByKey().observeSingleEvent(of: .childAdded, with: {
          snapshot in
          let firstName = (snapshot.value as? NSDictionary)!["profileForename"] as? String
          let lastName = (snapshot.value as? NSDictionary
            )!["profileSurname"] as? String
          self.posts.append(postStruct(firstName: firstName, lastName: lastName))
          DispatchQueue.main.async {
            self.tableView.reloadData()
          }
        })
  }
   
  override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
  }
   
  override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return posts.count
  }
   
  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? PostCell else { return UITableViewCell() }
    cell.firstNameLabel?.text = posts[indexPath.row].firstName
    print(posts[indexPath.row].firstName)
    return cell
  }
}