I believe, from several personal examples, that these will cancel. Most likely tonight, as UA's major schedule updates come on Wednesdays (and Fridays). I've noticed several times that flights zero out on Wednesday mornings, then are removed usually starting around 6PM CT that day. (Same pattern for Friday updates as well). Some discussion about Wed/Fri updates in this thread:
https://www.flyertalk.com/forum/unit...sure-tilt.html