iCloud account

You can view - and update - your Trusted Number(s) from ANY trusted device (within Settings -> AppleID) or from https://appleid.apple.com/

If you don’t have ANY trusted devices, click on “Didn’t Receive Code” when attempting to login at https://icloud.com/

A list of your Trusted Numbers (partially obscured) will be displayed.

From Mac , open system preferences > click on Apple ID icon > password and security , click on edit you will see tested numbers that are verified in the account .

See Change Password & Security settings for your Apple ID on Mac - Apple Support

Another method .

If you sign in with appleid.apple.com from a browser with account credentials , click over sign in security > again click on account security , you have to click on two trusted numbers , the window opens , scroll up they can be viewed .