Ok, So ammonia and nitrites will become present.
Ammonia first nitrite shortly after...once those two are both present awhile after that nitrates are present...thats what your looking for.
For now keep doing water changes especially when you see nitrites since you are fish in cycle you do not want the angel to die...water changes knock down the ammonia and nitrite as the tank establishes nitrates come and ammonia and nitrite go to 0 ....nitrates rise and anything over 40ppm is no bueno so hence again water changes ....whenever, Regardless of how old or established a tank is if ammonia and nitrites are there water changes..basically water changes water changes....water changes lol