Gains vary from person to person but if you start with this routine and very gradualy add more intensity, you should make gains of 2 inches or more in length within a period of 1.5 - 2 years. Its not unreasonable to expect more than 1” of girth gains in this kind of period as well.
If you practice and respond to the exercises well and you will encourage good gains.
Some people get a jump of up to one inch within the first 2-3 months but don’t count on that. Growth tends to be faster earlier on, so if your targets are modest you will be able to reach them more quickly.
You should be willing to put in the time if you really want the gains. It is simply a matter of time and effort.