The match will occur (almost) at the "correct" point in time during the simulation. However, if you sample the value from an unrelated process, there might be some process evaluation ordering dependency (i.e. whether the update_method had already been run). It depends on your requirements, whether this might be an issue.
If you do the checks outside of the simulation, i.e. between sc_start calls, you would need to complete the deltas (as per the loop sketched above) before every check. You cannot call sc_start during end_of_simulation.