It WILL become a problem.
The biggest issue with RSI and other repetive-use injuries (which happens in many professions and even athletics, especially with bad form) is that it happens slowly, then suddenly. It's so slow that it's discomfort. And you ignore that discomfort, especially as your concentration is on a computer monitor with important stuff to worry about being displayed on it. Also, sometimes inflammation happens later (later that night, later that week, etc.).
Start now to reduce your RSI (and RSI isn't your only problem, more on that below):
Get an external keyboard either that has an ergonomic design is is comfortable for you, and a mouse too. A Mac keyboard will be nightmare, don't use it. A Mac 'Magic Mouse' or trackpad will cause damage. It's not made for serious long-term work (there might be a lawsuit one day).
Pro tip: this may sound crazy, but get two mice, one left, one right. Change often. Learn to use the lefty even if you're right-handed, or vice-versa. You'll be surprised at how quickly you get used to it (and you'll laugh when someone tries to show you something on your workstation).
Get a desk that moves up and down. Spend some time standing, some time sitting. Again, change often.
Next, other than RSI is your neck and back. As your rhomboids get stretched and weak from forward rotation of the shoulders, the rear neck muscles get stretched and weak, the serratus goes unused, the chest and front-neck muscles get short and tight... You arch your head forward which causes your head (which already weighs about 8 pounds) to exert a lot more than 8 pounds of force on those muscle groups. And you also look at your phone all day, which you hold down below you. Well you're in for a world of nightmares and headaches that'll make the RSI a distraction by comparison.
Start early to avoid these things, before it becomes too late.
Sincerely,
A guy with some greying and screwed up wrists/hands and neck.