Pop up virus warning on my MacBook Pro

I have copied the words below, what ought I do about this, it's happened before.

Your system is infected with 3 viruses!

Thursday, August 22, 2019 7:32 AM

Your Mac is infected with 3 viruses. Our security check found traces of 2 malware and 1 phishing/spyware. System damage: 28.1% - Immediate removal required!

The immediate removal of the viruses is required to prevent further system damage, loss of Apps, Photos or other files. 

Traces of 1 phishing/spyware were found on your Mac with OSX. 

Personal and banking information are at risk. 

To avoid more damage click on 'Scan Now' immediately. Our deep scan will provide help immediately!

0 minute and 0 seconds remaining before damage is permanent.