It is 2100 miles from Guatamala to the US. There is no way they are going to be halfway up from Mexico. That would require marching 155 miles/day.
That Mob would be lucky to go 5. Stonewall Jackson’s superbly disciplined brigade could make 15.
The result of this will be thousands of people starving in the middle of Mexico and a multi-nation effort to deal with it will ensue.
They only walk for the photo opportunities.
They ride in buses the rest of the time.
They will not make it to the US border by Nov 6!