welcome to oscarfishlover
how old are your Oscars? You normally read the Oscars sexually mature at about one year old. I actually think this is a little early. From my experience, Oscars will become sexually mature from 16 months onwards, my Oscars are around 18 months old and have just become sexually mature. I bought seven Oscars in the March they were probably around two to three months old then, said in the last three weeks, two sets in two different tanks have started showing signs of sexual maturity as in female Oscars in both of the tanks laying eggs, although they didn't hatch.
If your Oscars are growing properly then I think you've got a fairly long wait