I'm new to here and not sure if I could ask this question here.
My wife and I are planning to visit a fruit farm in August. And I would like to send an email to ask the farm if they're opening on a Sunday.
Could anyone please help me on the enquiry? Not sure if the following is ok and polite enough? (I could only handle some broken travel Japanese

すめません、果樹園は日曜日で開業しますか?
Thank you in advance

Edward