Nounでよければ
文法の解説は英語です。
用法
Xでよければ presents a condition for doing something. It is also used when the speaker politely offers something to the hearer.
例文
この辞書でよければ、どうぞ。
If you don't mind here is the dictionary.
今日は忙しいけど、来週の日曜日でよければ、一緒に行けるよ。
Today I am busy, but next week on Sunday we can go together.