The sender inquires about a concise list that details these constructs along with an assessment of their relative maturity or development stage.

Probabilistic Timelock Contracts (PTLCs) are presented as a construct that is currently achievable with existing technology. They represent a state-of-the-art mechanism within the realm of smart contracts and cryptographic time constraints, offering a practical solution that can be implemented in contemporary systems. The mention suggests a confidence in the current usability and stability of PTLCs.

On the other hand, APO-like constructions are described as being significantly more advanced than PTLCs. This indicates that while APO-like constructions may offer superior features or capabilities, they are not yet as mature or readily implementable as PTLCs. The characterization of APO-like constructions as "leaps nicer" implies that although they are desirable for their potential benefits, they might still be in a nascent stage of development or require further research and innovation before they can be widely adopted.

The comparison between PTLCs and APO-like constructions serves to highlight the spectrum of technological readiness within programming constructs, ranging from readily available solutions to those that are on the cutting edge but may not yet be fully realized in practice.