What are these insects and are they good or bad for the plants

[tnkrer]

Spotted these in last few days. Don't know what they are or whether they are good or bad.

Is this a roach? on brandywine.



There are few of these shiny flies flying around tomato. May be they are pollinating the tomato? Since bees don't seem to care for tomato.



And saw this on the cuke leaf and where it was sitting, the leaf had a cut/hole. Not sure if it caused it though. It jumped away before I could take second pic.



Thanks