It was meant to start at 11 PM PDT
Yes, did you mean for it to wait until this coming Wednesday at 11PM PDT (UTC - 7)? If so then this is correct. You can find all of these in ACP Help, including the exact syntax. You can omit the date and the seconds too:

#waituntil 1, 06:00

which will wait till 11PM on the night the plan is started in ACP (any night).