Ammonia is at 1ppm when will nitrites show up?

I just started cycling my tank for about 4 days already and I just now tested my ammonia and it's at 1ppm and ph is at 8 is this good? I tested nitrite and nitrate also but both came out at 0. When should nitrite start showing up in my tank? Should I stop feeding my fishless tank fish food and take out my dead shrimp now? Or should I wait a couple more days?