Keep in mind you have a Mercedes. That’s a higher labor cost by the hour. Mercedes parts are cost more than my 2015 Silverado for example. A quick look up shows that your water pump cost literally double than mine. Then you have to add coolant. $25 or so for one gallon. How much do you need?
That’s extremely dangerous and should not drive one inch without it. You don’t risk brakes or tires. Those can kill you or others.