Similar ceramic or crystalline superconductors took a long time to convert into useful cables. One technique is to fill a hollow silver(!) tube with powder, and then press it flat to compress the grains so that they touch. It may be possible to re-use similar techniques as-is, but that's hard to predict.

One theoretical paper suggests that the copper doping has two ways of occurring in the crystal structure, and that the more energetically favoured one is not the desired configuration. It may be very challenging to produce the desired crystal structure in bulk, and then it might not be stable over long time periods.

With most superconductors, they start to lose their benefits close to their critical temperature. So this material may not be able to support strong magnetic fields or high currents.

I expect thin-film applications to happen first. It's easy to control, easy to make large contiguous surfaces, and very useful for all sorts of things. Thin motherboards, LCD/OLED display panels, flat antennas, etc, etc...