GUI JButton Not Updating On Time

I'm working with code that is essentially a file mover program. What I'm attempting to do is after the user clicks the submit button which calls the file mover, the text of the button would change to 'Working'. I have a basic understanding of why it didn't work when I just set it, but I tried to use SwingUtilities to call it in the background. However, it still waits until after the method call ft.FindSpot has completed before displaying any changes.

            public void actionPerformed(ActionEvent arg0) {
            if(!textField.getText().equals(""))
            {
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        btnSubmit.setText("Working...");
                    }
                });
                //btnSubmit.setText("Working...");
                ft.FindSpot(textField.getText(), comboBox.getSelectedItem().toString(), progressBar);

                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        btnSubmit.setText("Submit");
                    }
                });
            }
            else
            {
                ft.warningMessage("The ISCII textbox cannot be blank.");
            }
        }
    });

I managed to fix the issue by putting the ft.FindSpot in the invokeLater Swing Utilities function so that it was called from a different thread.

        btnSubmit.setFont(new Font("Verdana", Font.PLAIN, 12));
    btnSubmit.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            if(!textField.getText().equals(""))
            {
             btnSubmit.setText("Working...");
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        ft.FindSpot(textField.getText(), comboBox.getSelectedItem().toString(), progressBar);
                    }
                });

                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        btnSubmit.setText("Submit");
                    }
                });
            }
            else
            {
                ft.warningMessage("The ISCII textbox cannot be blank.");
            }
        }
    });