How to return a value to the main thread and display it?

Question

Java

Good day,
the problem is in the following,
I'm trying to fasten my small application with a progress bar
in the controller class, when the button is clicked, the following code is executed

public void calculate() {
        button.setDisable(true);
        new Thread(this::calculationStart).start();
        button.setDisable(false);
    }

new Thread(this::calculationStart).start();
here the following method is called in a separate thread

protected void calculationStart() {
        double progress = 0.0;
        String s1 = steamIdTextArea.getText();
        int accountId = Integer.parseInt(s1);
        MatchHistory history = null;
        try {
            try {
                history = api.getMatchHistory(MATCHES_AMOUNT, accountId);
            } catch (IOException e) {
                resultText.setText(e.getMessage());
            }
        } catch (RuntimeException e) {
            System.out.println(e.getMessage());
            System.out.println("Task can't be completed");
            throw new RuntimeException("Closing ...");
        }
        List<Long> matchesList = calc.matchIdList(history);
        ArrayList<MatchDetails> matchDetailses = new ArrayList<>();
        for (Long matchId : matchesList) {
            try {
                progress += 0.05;
                matchDetailses.add(api.getMatchDetails(matchId));
                final double finalProgress = progress;
                Platform.runLater(() -> progressBar.setProgress(finalProgress));
            } catch (IOException e) {
                progress += 0.05;
                final double finalProgress = progress;
                resultText.setText(e.getMessage());
                Platform.runLater(() -> progressBar.setProgress(finalProgress));
            }
        }
        List<int[]> scoreList = calc.playerScore(matchDetailses, accountId);
        double averageKDA = calc.averageKda(scoreList);
        resultText.setText("Average KDA for last " + MATCHES_AMOUNT + " rating games = " + averageKDA);
    }

I think it’s not entirely necessary to delve into the code, the problem is in the last line of this method
in it, I try to update the text from the main thread, but it doesn’t work by itself, hence the question, how can I update the text in the UI from the main thread after executing this method flow?