Caveat if you allow me here
Good idea the Terminal command
Having done that myself, for different reasons on day of release
1 - The Full Tahoe 26.0 application is about 17 GB in size
Not an issue if place permits
2 - Did the initial UpGrade from Sequoia 15.6.1 to Tahoe macOS 26.0
The installation on a M2 Desktop was a Semi Freak Out experience
From time of Starting the installation to the the Final Reboot and log In
Was about 90 Minutes
There was one point where it seemed to Pause at 31 mins, as per the count down clock
It lied, in real time the 31 minutes was clocked at 45 - 50 minutes before it would move forwards
Another thing you should be very aware of
During the Initial Setup process
There is no choice presented to Enable or Disable FileVault - if this matter to you
If not, I turned FileVault OFF there after - personal choice
Good luck and hope you have a better experience that I did ( Time wise for installation )