While lot of applicants are waiting for the dates to open and file I-485, there are lot of things that can be done before the priority date become current, from the applicant's side. One such is Vaccination Record.
As part of I-485, most applicants are required to file I-693 -- Report of Medical Examination and Vaccination Record.
It asks for vaccination records for:
- Hepatitis B
- Hepatitis A
- Tetanus and Diphtheria Toxoids
- Any other vaccine-preventable diseases recommended by the Advisory Committee for Immunization Practices
The form has to be filled and signed and sealed in an envelope by an authorized civil surgeon. There are expiration dates for these forms and the actual form filled by the doctor. So, it is best to wait for your date to become current and then do this form.
But, what can be done earlier is, take this list to your primary care physician (PCP) and see what all is appropriate for your age and take those shots. Some of them might be covered by your health insurance.
This way, when the priority date becomes current, you can request the record from PCP take it to the authorized doctor and get it signed.
USCIS link on vaccinations:
USCIS link on where to find authorized civil surgeons:
USCIS link about I-693 form:
USCIS link about I-485 form: