Most likely. In my experience EK will sell all available Y seats + all available J seats + all available F seats as Y seats (i.e. if there are 3 seats open in F, 10 in J and 10 in Y EK will sell a further 23 Y seats) +/- whatever their forecast says will still be sold, which is quite accurate.

That means it may be oversold in Y, it may just be sold out exactly, with the expectation that there will also be full J and F cabins, it may also open up again if the forecast sales in J and F don't meet expectations or if someone cancels in Y.

A lot of movement on loads takes place in short spaces of time, For a flight on the 30th it is impossible to confirm now that it will be oversold, even if it is right now.