first thing is who told you about Altcoin Season?when we all knew that before altcoin grows up its bitcoin must be the first/so if you wanna call a season it must be a Bullrun mate and that is what will happen.
about the time?nothing specific but if you are asking in general?yeah this will happen maybe soon or in near future.
The BTC dominance is an important factor, without considering it calling the uptrend as an alt season is not correct. Dropping the BTC dominance rate will solve the correlation problem and the 30% correlation can change everything completely for both altcoin investors and projects. Regarding the timing of the market, all guesses by individual crypto traders are the speculation, nothing else.