The plant and agar look pretty good. I think you could leave it for some time. The bigger the plant when it comes out of the agar, the better it will do.
If the agar starts getting what looks like obvious mold, it is time to move. Or, if the agar begins dessicating.
The plant is large enough it should not be damaged by just-warm water. Use this to help dissolve and loosen the agar. Then pour out the mess into a bowl. Rinse off most of the agar with warm water, but not too warm.
Pot the small plant in a small pot with very small bark, long-fiber sphagnum moss or horticultural perlite. Don't let it dry out. Put it inside an enclosure so it stays very humid. Plastic take-out food containers with transparent tops work well for this, as do large jars. Set the pot inside the jar lid, invert the jar onto it and screw it down.
Set the plant where it gets bright shade, but no direct sun ever.
In a few weeks you can begin opening the enclosure slightly and admitting some air. Gradually increase this until the plant is in the ambient atmosphere.
Oncidiums, especially seedlings, don't every like to dry out completely. But they also don't like to stay dripping wet. Many people find this easiest to manage in long-fiber sphagnum moss.
Begin feeding right away with very dilute fertilizer, say 15-25 parts per million nitrogen (ppm.) You can find a dilution calculator at the First Ray's Web site - look for the Free Information section.
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