❔ how to add parallel processing?

I have following function:

[DeliveryHandler( Name = ReportsAPI.Commands.ReportsGenerate )]
public async Task OnReportsGenerate(
           IDeliveryHandlerContext context,
           ReportsGenerateArguments arguments )
{
      /// reports are generated sequentially for now
      /// think about parallel processing

      async Task GenerateProgress( ReportGenerateProgress progress )
      {
            /// fill progress payload
      }

      // generate report logic
}

I can call OnReportGenerate from bus and report will generate sequentially/ So.. how can I fix this?
And another question: how can I add progress?

I don't need solution
I'd like to receive any advices

I'm not sure what you're asking

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