The final result depends on a lot of things. i.e. genetics, environment, co2, h2o, humidity, light, etc.... Many bags seeds have produced good bud. Your photo shows a happy plant with indica type leafs.
Flowering is triggered by changing the light schedule to 12hr ON 12hr OFF
Many people will take clones of their mother or a big plant like this and flower them when they're 6"-12" tall. Remember the plant will double tripple in size when you trigger flowering by changing the light schedule. This will be a BIG plant if you flower it. I hope you have the room....
Are you growing this indoors? What type of light are you using?