Fascinating discussion...I've wondered that as well, whether the Wave has already passed. If I look at all the evidence, then I don't think the peak of the Wave has passed yet - however, the Wave would have an increasing onset, perhaps a leading edge that rises like the tide before the actual tidal wave, and I think this is what we're seeing now. Those closer to shore will face high water sooner than those more inland, so there's a difference in timing between the level of effect experienced.
My thoughts on the Wave are as follows: the C's define it as a "realm border wave" - meaning a wave that will bring with it a crossing of the border between one realm of experience and another. Realms are like radio stations, determined by a particular frequency and holding a particular range or flavor of experiences. So the Wave brings with it a change of station, or perhaps a change going from "radio" to "TV" type station.
Realms can be very closely bound with only minor differences, like the realm of people who are equally physical to each other but don't have the same theme of life experiences or learning lessons. Or, realms can be very different, like beings in alternate realities or timelines who don't interact with us directly by default.
If the Wave has a leading edge, then we should first be experiencing minor realm separations. This would lead up to an eventual "total realm split" when the Wave peaks. I think this explains what's happening now. A minor realm separation between you and another would mean that each of you begin sharing fewer and fewer experiences with each other - basically a parting of ways. This is marked by increased differences in viewpoints, lifestyle, etc... -- basically, the polarization phenomenon.
As time goes on, I think this can only increase -- birds of a feather flocking together, leaving those who no longer have a needed place in their realm. That starts getting into the "switching timelines and leaving behind a shell" idea -- if your realm is separating from the majority of those around you, then what you see of them in your reality is just a faint echo of their true selves.
And were the realm separation to increase even more, eventually you could have total timeline splits between sections of the population, entire masses experiencing different future earth scenarios.
In the end, it may conclude with not only a 3D timeline split, but an actual density split between those who choose 3D versus thus who choose 4D.
As this all goes on, the veil continues to thin, and so increased UFO sightings, ghost sightings, synchronicities, reality malleability, etc... should become manifest. That's happening already. The question is, whether we have passed the peak, or whether the peak is yet to come. Well, as far as I can tell, grays and reptilians are still invisible when they choose to be, so that means they are on one side of the veil and I am still on the other...meaning I haven't crossed over yet. If the divisions between 3D and 4D are fuzzy rather than sharp, then whether we're upper 3D or lower 4D would be a matter of perspective.
Acquiring fringe knowledge is like digging for diamonds in a mine field.