Well..you have to have an online wallet where your coins come and where you can collect Bitcoin , in time so yes it provides you an online income.
yes you are right, every process of bitcoin performed online, even if we want to use our bitcoin in shopping then whole process comes to online and we make deal online. Let me tell you more things about bitcoin then peoples actually believe that bitcoin is online earning, bitcoin never exist in real life, I mean it only remain on internet.