When the maintainers decide to release a stable.
Without seeing the specific rule I can only provide so much advice.
But I would use [Deprecated] Design Pattern: Time Of Day to manage the times of day. I would store the dimming percentages for each light in separate Items named using Design Pattern: Associated Items to make the items. Then I’d have a single rule that triggers when the time if day changes, loops through all of your dimmers and sets the lights value based on the Item that stores the value for that time if day and light.
In fact, I don’t have dimmers but this is exactly how I control my lighting and I’ve been helping @skatun implement something similar for his heating using this approach.