> they have raised the money for building the three prototypes

Indeed. So the overall project status in terms of the individual phases is currently as follows:

0. 12600 EUR: Electrical schematics [accomplished]
1A. 19000 EUR: PCB [accomplished]
1B. 5000 EUR: Fast SI bus simulations [accomplished]
2. 13500 EUR: Prototypes [accomplished]
3. 14000 EUR: Testing [open]
4. 12500 EUR: Certification [open]

If they keep their overall pace of 65% accomplishment in 4.3 years (= 15% per year) then it will be done in early 2024.