Happy Alien Day 2020 everyone! To answer your question, I don't know either.
I wanted to get a box of 2018 Upper Deck ALIENS for today, but none ever came up until last week. While I am here, I'll let everyone know I contacted Upper Deck a few weeks ago to see when Alien3 will be released, they said there is no definite date, even for this year. It will be worth the wait tho
I also almost purchased a Sigourney Weaver "Actor Reactor" autograph from the UD Aliens set, but backed away.