Great timing. I used this same batch of ECY02 ( prop July 1st?) in a brown ale this weekend. Lag time for this yeast in a normal temperature and without a starter is realllly long if it isnt super fresh. Next time I would recommend a starter and kick the heat to at least the mid 70s to get it running. (the sacc strain in it seems to love heat)
If it is still hasnt gone by tomorrow, I would pitch the other yeast, just so the bugs don't take over before the Sacc can have a chance. Either way,, I think you will be fine.