Hey JibbyJack!
To be completely honest with you, yes, you have indeed waited a bit too long to repot.
Here’s why the situation is urgent based on your photos:
1. The beginning of flowering
It’s clear from your pictures that the plants have already started producing pistils (the little white hairs at the top).
When a plant begins its flowering phase in a container as small as a cup, it risks becoming "dwarfed" because its roots send a signal to stop growing due to lack of space.
2. Rootbound
Given the size of the above-ground part of your plants, the roots have most likely already colonized all the available space in the red cups.
They must be starting to curl at the bottom of the pot (the phenomenon of root circling), which will significantly hinder nutrient absorption and the future development of the plant.
3. What you need to do immediately
Repot now: Transfer them directly into their final pots to avoid a second repotting stress later on.
Be very gentle: At this stage (beginning of flowering), even the slightest root stress can block the plant for several days, which would be disastrous for your final yield.
Transition watering: After repotting, water with pH-adjusted water and possibly a bit of root stimulator to help them explore their new space.
In summary:
Your plants look visually healthy, but they are screaming for more space. If they are autoflowers, every day counts because their biological clock doesn’t stop. The sooner they are in a larger pot, the more they can stretch a bit before focusing solely on the flowers.
I hope I could help you. Have a great day!