Is writing a father to be card message for Father's Day sweet for a friend?

My friend will be a father soon and he is super excited because they have been trying for it for a long time. So, I thought it would be sweet if I also greet him for this Father's Day. But is it sweet for a friend? Maybe that's too much. We are friends for years.

Is writing a father to be card message for Father's Day sweet for a friend?
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