The coup plans seem to be already going into action

It looks like the Trump coup plan is already being put into motion:

Kate McGee et al, Biden camp cancels multiple Texas events after a "Trump Train" surrounded a campaign bus Texas Tribune 10/31/2020

Lois Beckett and Alexandra Villarreal, Biden campaign says Trump supporters tried to force bus off highway 11/01/2020

Matt Mathers, Biden event in Texas cancelled as 'armed' Trump supporters threaten campaign bus Independent 10/31/2020

Apparently, this action was popular in some quarters:

From the Texas Tribune coverage:

The Federal Bureau of Investigation is looking into a Friday incident in which a group of Trump supporters, driving trucks and waving Trump flags, surrounded and followed a Biden campaign bus as it drove up I-35 in Hays County, a law enforcement official confirmed to The Texas Tribune Saturday.

The confrontation, captured on video, featured at least one minor collision and led to Texas Democrats canceling three scheduled campaign events on Friday. The campaign officials cited “safety concerns” for the cancellations.

There's also this:

Texas Republicans have asked a federal judge to throw out 100,000 ballots in Harris County cast through curbside voting. They drew Judge Andrew Hanen, one of the most notoriously partisan Republican judges in the entire federal judiciary. This is alarming. https://t.co/VODOZrCoUF

— Mark Joseph Stern (@mjs_DC) October 31, 2020

Wow: One of the Republicans asking a federal judge to throw out more than 117,000 valid ballots in Harris County is a COVID and QAnon conspiracy theorist. Great reporting from @ehananoki. https://t.co/roTEm4vMIM pic.twitter.com/8KGNQvGAow

— Mark Joseph Stern (@mjs_DC) October 31, 2020

Stern in his Slate article linked in his tweet (Texas Republicans Ask Federal Judge to Throw Out 117,000 Legally Cast Ballots 10/31/2020) explains in more detail what a crassly partisan-political move it is and how flimsy the legal claims behind it are.

The Confederate symbolism would have been more completed if the Klan-style attempted vehicular homicide and the frivolous lawsuit relying on a corrupted judiciary had taken place in South Carolina rather than Texas.

But one of the Carolinas also got into the act, as Julia Craven describes (North Carolina’s Police Attack on Election Marchers Had a Long History Behind It Slate 10/31/2020):

On Saturday, Alamance County sheriff’s deputies and city police pepper sprayed a crowd of about 200 people who were peacefully marching to the polls in Graham, North Carolina without warning and on slim reasoning. Graham police claimed that protesters didn’t have the adequate permits to close off the road, while the Alamance County sheriff’s office said that the march was shut down out of “concerns for the safety of all.”

If it is at all difficult to understand how a police department could act so heinously—particularly when children and elderly community members are present within the crowd— then it’s important for one to grasp the context that the law enforcement operates within. ...

Voter intimidation is an omnipresent concern in North Carolina, a state that has tried to prevent Black and brown voters from casting ballots with “surgical precision” since Reconstruction. During the late 1800s, a high-level white supremacist campaign in North Carolina went to extreme acts of violence - including massacring Black residents in Wilmington - in order to regain political power within the state. Less outwardly violent voter suppression tactics have cropped up in the state following the Supreme Court’s weakening of the Voting Rights Act in Shelby v. Holder, such as North Carolina’s infamous voter I.D. law and gerrymandering so precise that every district in the state had to be redrawn. [my emphasis]

The chances of a Republican coup to keep Trump in office even if he loses the votes depends in significant part on how big the margin for Biden is. It should not be that way. But that's how badly wounded American democracy already is.