I bought a Giant Talon bike and I got thinner tires.
Can I use it for road and streets now?
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Can I use it (Giant Talon) for road and streets now?
Yes you can. Here's your bike (if you have a 2020 Talon 2)
And they make fine commuter bikes.
Sometimes people will put drop handlebars on their mountain bike for better aerodynamics. Sometimes, as you have done, people will use narrower smoother tires.
It's all about trade offs
A pure road bike will be more aerodynamic and be configured (weight, riding position, gearing, etc.) for a higher top speed.
A mountain bike will give you more ruggedness, (given the condition of roads in some places this can be a big bonus) a lower top speed, and more comfort. If this meets your needs you will be happy.
Ride what you have and learn
At the end of the day ride what you have and learn what does and does not work for you and adjust along the way. Saddle time is the best way to learn.