Does the combat roach killing gel work?

So I gotten my apartment sprayed didn’t seem like it did a thing, I’m still seeing and killing roaches

So I took it upon myself to handle the problem, I got the combat killing gel today and applied it all over the walls and in my bedroom

Now the real question is does it work & how long does it take to kill them? I have a mild infestation & im super desperate to get rid of them

Please let me know how long that product takes to kill them!