How to retrieve data from CloudKit using SwiftUI

I am using SwiftUI to make an app and storing the data on ICloud. Because all the code I can find relates to Swift and viewDidLoad and TableView, however this do not apply. I have written code and seems to retrieve it but will not return it to the ObservableObject to be able to display in the SwiftUI

The ObservableObject file:-

import SwiftUI
import Combine


final class ObservedData: ObservableObject {
    @Published var venues = venuesData
}

The query to retrieve data

import SwiftUI
import CloudKit


var venuesData: [Venue] = loadVenues()


func loadVenues() -> [Venue] {

    var data = [Venue]()

    let pred = NSPredicate(value: true)
    let sort = NSSortDescriptor(key: "id", ascending: true)
    let query = CKQuery(recordType: "DeptfordHopData", predicate: pred)
    query.sortDescriptors = [sort]

    let operation = CKQueryOperation(query: query)
    operation.desiredKeys = ["id","name", "address"]
    operation.resultsLimit = 50

    var newVenues = [Venue]()

    operation.recordFetchedBlock = { record in
        let venue = Venue()
        venue.racordID = record.recordID
        venue.id = record["id"]
        venue.name = record["name"]
        venue.address = record["address"]
        newVenues.append(venue)
    }

    operation.queryCompletionBlock = {(cursor, error) in
        DispatchQueue.main.async {
            if error == nil {
                data = newVenues
            } else {
                print(error!.localizedDescription)
            }
        }
    }

    CKContainer.default().publicCloudDatabase.add(operation)

    return data
}

I have got data showing when do breakpoint at line 40 in data but does not return to venueData