Further to the above it occurs to me that i have missed a final point, being that it has been observed that at a quantum level the outcome of cause and effect relationship is probabilistic and that the outcome is determined by the observer.
It seem to me then that the fundamentals of reality are an observer/cause in relationship to an effect and that that the relationship is observed as the passing of time.
As I understand it, that's a misinterpretation of QM observation, where the outcome of a measurement is probabilistic and depends on the particular
measurement rather than the observer. This is a murky area, the QM 'Measurement Problem', but the general idea is that a measurement occurs when two quantum systems interact irreversibly, i.e. with decoherence, where the information disperses into the environment. What actually happens during that interaction is described variously by the different QM interpretations. 'Conscious collapse' versions of the Copenhagen interpretation, have been largely abandoned as too problematic. A QM 'observer' is now taken to be any interacting quantum system.
I prefer to think of our subjective experience of time as resulting from the fact that we remember the past but not the future; from sensory memory through medium-term to long-term memory, we process events
roughly in temporal order of perception (some jiggery-pokery occurs to adjust timings to be coherent). Subjective time is modulated by the density of significant experiential (memorable) events in 'real', i.e. external, time; experiential duration is shortened by higher rates of memorable events, and lengthened in retrospect.
The other point is, that under most QM interpretations, the observed properties don't actually exist until the measurement occurs - the wave function describes the likelihood of obtaining a particular result on measurement, not the likelihood of the observed system being in that state prior to measurement; i.e. a particle is not in either a spin-up or a spin-down state which you can then measure but is in a superposition of spin-up and spin-down states, and a measurement will probabilistically observe (and 'fix') one or other; a subtle, but important difference.
Apologies if I'm telling you what you already know, but it's a tricky and much-misunderstood topic.