I am not sure the EHAS portal application process is open on Saturdays and Sundays. I would do the PCR test and hope for the test result to be back in time. Most people say they are getting them faster than they expected. Fall back on the antigen test if you don't get results in time, but try to have your EHAS application in on that Friday as early as possible. With that Monday being a holiday, I would want my approval back by Friday.