I remember hearing about this film way back in 2018
It seems like Antlers is falling into a hole for awhile, much like New Mutants did. It's been delayed time and time again. This Guillermo del Toro produced film looks like it could be a modern horror gem when it does come out though!
Originally intended to be released on April 16th, 2020. Then after all of the COVID-19 delays, Antlers was pushed back to February 19, 2021. But now it has been removed from the release schedule all together.
We don't know when the new release date is. But I'm sure it'll be announced once studios have a clearer vision of how the next few months will affect cinemas.