I think rather than waiting for him to 'mature' and come out of this phase, perhaps you could work on how you cope and support him whilst it's happening. Alot of the time they react from our reactions. I know it's so so easier said than done but by remainong calm yet creating a safe space for him (letting him know you're there) then this can allow him to calm down alot quicker.
It's so important, especially at this early learning stage that children understand they can express their emotions, feel loved and supported and know you are their constant.
After the 'tantrum' or loss of control of emotions, communication is essential. Discuss what it was that upset him, why he reacted like that and how to manage this next time.
I have four children and have been a teacher for reception aged children for over 20 years, I have some experience in this area but obviously every child is different. Do seek more expert advice, but my main take away would be don't work on him work on yourself and how you react, it's a game changer!
Goodluck, you got this mama 💕