The present progressive tense in Persian is almost identical to the present tense in Persian, the only addition being the addition of dārad (دارد) prior to the verb in question. This emphasizes the presentness of the verb and denotes that the action is occurring right now, which is important to note given the fact that the imperfective present in Persian can also denote the future. Therefore, the usage of the present progressive in Persian is very common and ought to be used when one wishes to confirm or reiterate that one is doing something at the present moment.
Recall dāshtan (داشتن) from Lesson 10, since we're doing the present progressive, we obviously best conjugate said verb in the present tense. (You should, by now, be able to do so from lesson 10.) Examples of the present progressive in Persian include:
daram mikhoram (دارم میخورم) "I am [currently] eating."
dari mizani (داری میزنی) "You are hitting."
Darand bazi mikonand (دارند بازی میکنند) "They are playing."
Again, notice that the present progressive implies the action occurring strictly in the present tense, so no confusion is made between the present tense and future tense like the imperfective present.