Can I connect two monitors to my MacBook Pro using Thunderbolt 3?

Yes. The 2018 15" MacBook Pro has 4 USB-C / Thunderbolt 3 ports and supports up to 4 external displays at 4K and 60Hz. Or 2 external displays at 5K.

You will need an adapter to go from the USB-C connector to whatever the monitors you have support.

click here ➜ MacBook Pro (15-inch, 2018) - Technical Specifications - Apple Support

and here ➜ Use an external display with your MacBook Pro - Apple Support

That adapter should work, assuming the monitors you want to use have HDMI inputs.

It won't work through the USB ports though.

Hard to recommend anything without knowing what connections the monitors you want to use have.

For HDMI something like this should also work:

Ugreen Thunderbolt 3 to HDMI adapter - Amazon.com