Here's just some random RDU guy thinking out loud, so take with various grains of salt..
If no invasion was ever planned, that means Putin's goal was applying a military buildup to pressure getting concessions. The big one talked about is Ukraine NATO membership. If this was to get concessions, is this the only one? Does it also involve missile placement in other NATO countries bordering Russia? Also, if Putin's goal is to pressure for concessions, when would those talks be? I'd think there'd be a quick announcement of talks to help destabilize tensions or even some sort of summit. That has not come yet..
On the other hand, IF an invasion was planned from the beginning, Russia needs a reason for war (casus belli). If the invasion starts tomorrow (or a short time later), you'd think there'd be some 'incident' provided (made up or no) showing the US/NATO as the aggressor. (like a gulf of tonkin incident) We've heard a lot of talk about 'Western aggression' from Russia in a general sense, but I'm not sure if that works by itself as a reason internationally. Anyway, this is my long way of saying if tomorrow is invasion day, you'd also likely see an incident provided tomorrow too.
Also, if the invasion has always been set tomorrow, would Russia still go through with it since the date was leaked? You'd think they'd delay it that were the case. For this reason, even if nothing happens tomorrow, we probably shouldn't assume its off completely.