Once your I-140 is approved, you can apply to adjust your status to become a green card holder! Should you already be in the US, you can simply file at your local USCIS office. If you are still in Ireland, you can apply at the US embassy in Dublin, Ireland. You will then attend your interview where the immigration officer will make a final decision on your EB-2 visa
.After final approval, you may travel to the US and begin your job.