Is it proper in English to say I am wondering if you can come our home for coffee?

The sentence you proposed is not grammatically correct. The correct way to say it would be: "I was wondering if you'd like to come over for coffee."

In this corrected sentence, the verb tense has been changed to past tense, and "our home" has been changed to "over". "Over" is a more informal way of saying "to my house".