I had three glasses of wine on Sunday and did a EtG urine test on Tuesday night. Will I pass?

Chances are no. I can absolutely say yes or no, but the test is meant to detect consumption within the last 60-80 hours. There are cases where a person in your situation passed, but I wouldn't rely on that.

I would prepare for a failure, put your required affairs in order. Why were you taking the test? Employment? Parole/probation? Custody? Alcohol recovery program? Enforced sobriety can be hard but there are organizations for you if you need help. Look up your local chapter of AA. You don't have to join for life, but it could be good support during this period in your life.

Good luck.

Will my ethyl alcohol level be under 500ml after three glasses of wine 51 hours ago?

Ethyl Alcohol will be clear. Other tested substances, EtG may not. A level of 500ml has no relationship to testing. Where did you come up with 500ml? That is 2/3 a bottle of wine.