That's just an argument for time not being fundamental. Special relativity gives us a perfectly workable view of time as a symmetry relation on this eternal no

That's just an argument for time not being fundamental. Special relativity gives us a perfectly workable view of time as a symmetry relation on this eternal now you speak of. Thermodynamics, specifically the second law and especially in its kinetic theory, give us a nice view of time as a global statistics phenomenon of ensembles. Even more, there are solutions to Einstein's equations, that seem to allow time travel. All that said, you might be interested in the Wheeler-DeWitt Equation which takes a stab at quantum gravity and makes no mention of time. That said, it's also a far cry from the 20th century physics eternal now you seem to be envisioning.