Will iMessage deliver to a non-Apple phones.

GCFS:

To further clarify … they will be sent as SMS “text” messages by your phone’s mobile carrier.

They are not encrypted or secure “iMessages” (which are the blue bubbles”)

See a bit more explanation here:

What is the difference between iMessage and SMS/MMS? - Apple Support

Yes they will reply with green txt bubbles instead of blue

You’re certainly welcome.