English Translation
Are you ready yet?
Tip:
もう準備はお済でしょうか？(super polite like between a hotel manager and a guest)
もう準備はいいですか？(formal and polite)
もう準備はいいか？(casual and a bit bossy)
もう準備はいいかい？(casual and friendly; mostly used by a male speaker or by an old person including female)
もう準備はいい？(casual and friendly; mostly friend-to-friend or between family members)