It will appear just below the message bubble.  If "Send Read Receipts" is enabled by the recipient, then it will change to "Read" once the message has actually been seen. If you see "Sent as a Text Message," that means your message was sent using your carrier's SMS service rather than Apple's iMessage servers. If you see nothing listed under your last message, your message has not yet been delivered.
افتح تطبيق الرسائل. انقر على محادثة. اكتب رسالة. اضغط على زر الإدخال ↵ Enter. ابحث عن عبارة "تم التسليم" تحت آخر رسالة.