Hi, I completed my first salesforce certification after 24th july, As per one article published in trailhead,I should get free voucher, I should get one. Anybody knows abt it when will I get it?

Hi, I completed my first salesforce certification after 24th july, As per one article published in trailhead,I  should get free voucher, I should get one. Anybody knows abt it when will I get it?