Display Parallel Tasks Progress using C# in Windows Application

Hi

in my windows form i sync table from database1 with database2

So i read data from the first and fill the second

The tasks run concurrently

I do know how notify progress in windows progress bar 

tableProcessed/ tableToProcess

How can do that without touch performance of syncronization runtime?

        private async void Button1_Click(object sender, EventArgs e)
        {          
            try
            {
                 var watch = Stopwatch.StartNew();
                
                //read data from database1
                var readAgents = Task.Run(() => Agent.GetAgentAsync());
                var readAddressBooks = Task.Run(() => AddressBook.GetAddressBookAsync());
                
                await Task.WhenAll(
                     readAgents,
                     readAddressBooks
                 );

                //save data in database2
                var addAgenti = Task.Run(async () =>
                     AgenteApp.AddAgentiAppAsync(await AgenteApp.FillAgentiAppFromCompanyAsync(readAgents.Result))
                );
                var addRubriche = Task.Run(async () =>
                     RubricaApp.AddRubricheAppAsync(await RubricaApp.FillRubricheAppFromCompanyAsync(readAddressBooks.Result))
                );
                
                await Task.WhenAll(
                  addAgenti,
                  addRubriche
                );

                watch.Stop();
                var time = watch.ElapsedMilliseconds;
                textBox1.Text = $"End Tasks. Minutes: {String.Format("{0:0.00}", (double)(time / 1000) / 60)}";

            }
            catch (Exception ex)
            {
                MessageBox.Show($"Message: {ex.Message}Source: {ex.Source}HResult: {ex.InnerException}");
            }
        }