How to see my text messages on my https://www.icloud.com/ account from my laptop. I have my iphoneXR set up for messages but I am not showing the app on Icloud.com

They are stored on iCloud but there is not an option to view them at iCloud.com. See the information in Keep your messages up to date with iCloud - Apple Support including the following:

When you set up iCloud for Messages, your messages are stored in the cloud instead of locally on your device. You can see them on any device that’s set up for iCloud and Messages, including your iPhone, iPad, iPod touch, and Mac.

Because your messages are in the cloud, if you send, receive, or delete a message on one device, those updates appear everywhere. You see the most up-to-date version of your messages, no matter where you access them.