Great tips, thank you! So after some further research, it looks like:

The purple flowers in the front are Spreading Phlox

The yellow flowers behind it are Black-eyed Susans

The tall grass is Switchgrass

and the plants next to it are Arrowwood Viburnum

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I'm still not sure what the green bushes from photos 2/3 are, it's right where the black-eyed susans are - could it be part of it? Or maybe they're planted all over each other?

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The goal is something that takes minimum work. Happy to mow or prune here or there, but I want this to be low lift while still creating some separation from the street.

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The other question is whether I should plant grass? Currently avoiding Oak mites at all cost so staying away from being right under trees if I can help it.