Auto in 8th week - trim brown leaves in buds?

[Irie_man]

Hi, this auto is in the 8th week. Buds are growing nicely but the leaves are turning yellow and brown. My impression is that this plant's days are numbered. So here are my questions:
1. Should I be trimming the brown/ yellow leaves?
2. Until recently, I was giving in Bloombastic, but now just water. Is this correct?
3. How long should I wait before harvesting?
Thanks!