You have entered double zeros (zero ppm for ammonia and for nitrite) for what I presume is a 12 hours (hours since ammonia was added) test and you've entered that in your log for 6 days straight.
But then in the post right above this you say "they are more or less at zero." Are both ammonia and nitrite really testing at zero or are you rounding down to zero?
Regardless of which, you are clearly either basically already cycled or very, very close. Of course there's always a small chance of getting a spike after adding fish (no system is perfect) but in the vast majority of cases the biofilter has been really solid after a qualification week like you've been doing.
So its really down to planning the final logistics of whether you can actually get the fish you want for your first stocking (its always nice to take advantage of the fact that the colonies are at a level higher than most any reasonable first stocking will be. Or, the tank can hold just fine by you continuing to just put in ammonia, while the fish come in. Are you thinking about the upcoming weekend for the big water change?
~~waterdrop~~