Unless something very unexpected happens, the answer is "yes" to both. This year's snowpack is below average and seems to roughly match that of 2018, so I'm expecting the switchbacks to be open by mid June:
http://www.whitneyzone.com/wz/ubbthreads.php/topics/53085/When_will_Mt_Whitney_switchbacThe trail head will open in June as well, but it's unknown whether it will be June 1, 7, 15, or June 30:
https://thesheetnews.com/2020/04/24/dont-hit-the-road-jack/http://www.whitneyzone.com/wz/ubbthreads.php/topics/56955/Whitney_Portal_Opens_June_1st
