Hello and thank you for using JA.
I would like to ask you to do the following testing.
Remove the thermostat from the housing, then put the housing back, open the radiator cup, then start the engine, once the motor is running look on the radiator filler hole, and rev the engine a little bit, about 2000rpm, you should see the water flow freely, if there is no movement on the water or just a minimal flow, you have problem with the pump.
The water flow should be like a streaming water on the river.