u/jerrysaiddance

EDIT: thank you all for the help you are giving, I’m just a young gal with no idea what I’m doing to be honest and no one that I can ask that I know.
I’m adding a couple photos of the plug/ other side of plug and my power box.

I am located in the US and got a treadmill delivered that is not the correct plug. The technician told me I could just use an adapter.
My house is standard rated, built in the 90s. Is it actually safe for me to use an adapter or should I have the plug switched?
Including photos of adapter and also of treadmill plug and machine. The plugs in my garage are just standard plugs so it won’t plug into them.
Thank you!!