I have an application that before starting needs to unzip a file (using QProcess), and the operation may need some time, and then it should open a QML file that uses the unzipped files.

I'd like to show a message, a loading indicator, something like this, until the unzipping process is ended. I tried something like this:

QPushButton button("loading, please wait");
button.show():

unzip();

butt.hide()

const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

 return app.exec();

but the button showing is completely blank, and loads its text only after app.exec() is executed, so after the unzip has ended
what can I do to make it show before the unzip process has ended?

thank you in advance!