How to query updated documents - Swift?

func fetchModifiedDocuments<T: Codable>(
        collectionId: String,
        since timestamp: TimeInterval
    ) async throws -> [AppwriteModels.Document<T>] {
        do {
            let query = Query.greaterThan("$updatedAt", value: timestamp)
            let documents = try await databases.listDocuments(
                databaseId: AppwriteConstants.DATABASE_ID,
                collectionId: collectionId,
                queries: [query],
                nestedType: T.self
            )
            
            return documents.documents
        } catch {
            print("Error fetching modified documents: \(error.localizedDescription)")
            throw error
        }
    }