Pre Check was active at 9ish this morning as I went through. Asked again if hours of Pre-Check will ever be posted online. Got a non-answer that Pre-Check is dynamically staffed in E and as such there are no fixed hours.

I've found that its generally not been open, which means Pre-Check Lite, in the mid-morning into the afternoon. They seem to open again in the later afternoon for the bank of East/South Bound long hauls.