I got the answer to my question...it seems its bloom cycle is like most Oncidiums.
There's 3 new growths and in one of them I found a spike peeking out.
Hope it takes less than a week to bloom. I'm going abroad for a few days and I hope to see them.
Fortunately the flowers are fairly long lasting. Mine first opened April 5, took another week or so get both spikes open, and is still looking quite good. So if you are not away too long, it will wait for you... (Much better than Stanhopeas that open and then die i a few days!)