Congrats on your first brew and welcome to the forum. Believe it or not, I brewed the same kit for my second beer. Turned out great and Ive been brewing for 2 years now.
Not checking the OG is terrible advice in my opinion-kit or all grain. You get a OG and FG (final gravity) reading to determine a number of factors including efficiency, fermentation progress, and alcohol content. But these readings can very based on batch size, yeast activity, etc. Gravity readings are very important for a number of reasons-especially as you progress to partial and all grain.
Chances are, if bubbles are no longer visible in the airlock, that fermentation is complete. However, you should look at the beer itself. If the liquid is still "moving" with particles floating about or there is a layer of krausen still on top of the beer it is still fermenting. But to be safe, you can only wait or determine completion based on OG and FG which you cant since you dont have a OG.
You can do what you want but I would suggest letting it be for a 3 weeks from the brew day -Dont touch it, dont let it sit in the light, and make sure the temperature is within the recommended range for the yeast. This way the beer will clear and fermentation is sure to be complete. Bottle after week 3 but be careful of the amount of priming sugar you use. Unfortunately, without the OG and FG, you cant really calculate the exact amount of suggested priming sugar. So use the recommended amounts with the kit. I would use a little less.
If you bottle early-before fermentation is complete- you are likely to create bottle bombs (which suck) as well as a inferior beer. Let it be and brew another batch. The first is likely to go quick.