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Please read:

http://books.zkoss.org/wiki/ZK%20Developer's%20Reference/UI%20Patterns/Long%20Operations

The simple approach (if you don't need to inform the user when the work is finished)... call runReports as dedicated Thread:

public void myBtn_onClick() throws Exceptions { 
  new Thread(new Runnable() {
    public void run() {
        runReports();
    }
  }).start();
  Messagebox.show("Reports are being run and you'll get email notification shortly....");

Cheers, Maik