Timor red is not a great jackfruit IME.
And it does not have red arils IME.
The name is deceiving.
It’s cruchy.
It’s worse then a number of our random seedlings.
It’s no way close to amber in quality IME.
I am just saying this so that people don’t think it’s just their tree that isn’t good or meet up to hype etc.
Real “red” or “very dark orange” jack is really good IMO!
Like 10/10 and Timor is like 4/10.
Not hatin just my opinion

At around 10cm girth the jackfruit tree will be able to hold a fruit to maturity and should be flowering,IME.
And thats anything from 2-3 years from seed sown for a seedling.
But depends on environment.
Usually young tree’s don’t give good flavour if many fruits are kept on.
We thin out the fruit early on for young tree’s.
Peace!