How do you check sms/OTP/text using web interface on your laptop?

This probably depends on your particular dongle model. Back in 3G era, some carriers offered USB modems with SMS locked out in the firmware, but you could flash a firmware from a different operator (also install their variant of software, the only difference being the added SMS tab and a different skin) and then you can text and even use USSD! (No calls, though.)

yeah my vendor's dongle has this specific feature. A light also turns ON on the modem when SMS is received.

https://messages.google.com/web/ is one way I'm aware of, I'm sure there's others depending on the messages app used.

It seems those modems run Android 4.x with the stock messaging app: https://github.com/u0d7i/uz801#screenshots

But I guess you can install a custom messaging app that would sync the messages? (If there’s one that still supports such an old version of Android)