If it were mine, I'd say full opening tomorrow, but yours has proven to be a little slow. Congratulations, it's not uncommon for spikes to blast when moved (ie bought).
That's always the risk with transport of near blooming plants. My initial flowers (open when I got the plants) didn't last long. The subsequent ones are open now and look better. Though they're not going to last as long as a phalanopsis *lol*.
I have the same problem. Mine have been teasing me for days. They look a lot like yours too. Mine is a Rodricidium Apple Hollow X Rodricidium Maple Hollow.
I bought it in spike and the spike grew pretty quick but the flowers seem like they take forever to fully open. Maybe it is just me being impatient.