Как обновлять интерфейс со старта программы постоянно?

import sys
import psutil
from PySide2 import QtCore, QtGui, QtWidgets
from ui_mainwindow import Ui_Dialog
 
app = QtWidgets.QApplication(sys.argv)
Dialog = QtWidgets.QDialog()
ui = Ui_Dialog()
ui.setupUi(Dialog)
Dialog.show()
 
def update():
 cpu = (str(psutil.cpu_percent(interval=1))+'%')
 ram = (str(psutil.virtual_memory()[2])+'%')
 ui.label.setText(cpu)
 ui.label_2.setText(ram)
 
update()

from PySide2.QtCore import (QCoreApplication, QMetaObject, QObject, QPoint,
    QRect, QSize, QUrl, Qt)
from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QCursor, QFont,
    QFontDatabase, QIcon, QLinearGradient, QPalette, QPainter, QPixmap,
    QRadialGradient)
from PySide2.QtWidgets import *
 
 
class Ui_Dialog(object):
    def setupUi(self, Dialog):
        if Dialog.objectName():
            Dialog.setObjectName(u"Dialog")
        Dialog.resize(295, 325)
        Dialog.setAutoFillBackground(False)
        Dialog.setStyleSheet(u"background-color: rgb(0, 0, 0);")
        self.label = QLabel(Dialog)
        self.label.setObjectName(u"label")
        self.label.setGeometry(QRect(140, 70, 120, 60))
        font = QFont()
        font.setPointSize(28)
        self.label.setFont(font)
        self.label.setStyleSheet(u"color: rgb(255, 255, 0);")
        self.label.setScaledContents(False)
        self.label_2 = QLabel(Dialog)
        self.label_2.setObjectName(u"label_2")
        self.label_2.setGeometry(QRect(140, 160, 120, 60))
        self.label_2.setFont(font)
        self.label_2.setStyleSheet(u"color: rgb(255, 255, 0);")
        self.label_3 = QLabel(Dialog)
        self.label_3.setObjectName(u"label_3")
        self.label_3.setGeometry(QRect(30, 70, 90, 60))
        self.label_3.setFont(font)
        self.label_3.setStyleSheet(u"color: rgb(255, 255, 0);")
        self.label_4 = QLabel(Dialog)
        self.label_4.setObjectName(u"label_4")
        self.label_4.setGeometry(QRect(30, 160, 90, 60))
        self.label_4.setFont(font)
        self.label_4.setStyleSheet(u"color: rgb(255, 255, 0);")
 
        self.retranslateUi(Dialog)
 
        QMetaObject.connectSlotsByName(Dialog)
    # setupUi
 
    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QCoreApplication.translate("Dialog", u"Dialog", None))
        self.label.setText(QCoreApplication.translate("Dialog", u"23,2%", None))
        self.label_2.setText(QCoreApplication.translate("Dialog", u"23,2%", None))
        self.label_3.setText(QCoreApplication.translate("Dialog", u"CPU:", None))
        self.label_4.setText(QCoreApplication.translate("Dialog", u"RAM:", None))