Wait for the next action

Hi all!

Tell me, please, how can I make a delay before the next action. In this case, I still need to update the progress bar.

Code:

void ClassName::start()
{
    action1();
 
    /*
    
    Here I need to wait a while, update the progress bar, and go further
 
    */
 
    action2();
    emit finished();
}

I tried to do it this way, but it does not work.

Code:

void ClassName::start()
{
    emit mainLabelEmit(QString("ÐºÐµÐº"));
    QTimer *timer = new QTimer(this);
    timer->setSingleShot(true);
    timerCount = 10;
    //timer = new QTimer();
    timer->start(timerCount * 1000);
    while (timer->remainingTime() >= 0)
    {
        QString smallLabel = QString("Left %1 sec").arg(timer->remainingTime() / 1000);
        //qDebug() << smallLabel;
        emit smallLabelEmit(smallLabel);
        if (timer->remainingTime() == 0)
        {
            timer->stop();
            emit smallLabelEmit(QString(""));
        }
        else
        {
            emit progressBarEmit(100 - 100 * timer->remainingTime() / timerCount);
        }
    }
 
    for (int i = 0; i < 7; i++)
    {
        emit open(i);
    }
    for (int i = 0; i < 7; i++)
    {
        emit close(i);
    }
    emit finished();
}

Thanks!