Need 30-60x magnification, a phone's camera usually isn't good enough even if it advertises such magnification.
currency checker or a usb microscope will do you good when checking trichomes.. Spend more for ease and or field of view. The cheap ones are fine ($5-7)
Plant doesn't look 5 days away from pictures. Don't go by some marketing material that said this plant is done in "8 weeks" because it very often isn't true. Read and react to plant. Don't set a schedule for it unless you've grown it several times and it is a clone.
You can google for the 1000+1 opinion on when the exact time to harvest is... 10-70% amber trichomes typically covers most opinions. What isn't an opinion is that amber is actually a sign of degradation of the active ingredient. Some degradation is likely best to maximize the total. Foggy and plastic-looking trichomes are ripe.