I have to do an emergency migration from one farm to another on Saturday. I
have already copied backups from the current farm to the new one in
preparation. After EOB late Friday/early Saturday, I am going to take the
latest backups and move them over to the new farm. Would it be okay if I ran
a batch file with the -o restore & -overwrite commands on the new farm? Or
should I run each command individually?

I currently do batch files for backups without any issues. I just want this
procedure to go smoothly without any hangups. I wasn't exactly planning on
doing this, but then again it is an emergency of sorts.