ITC on RCM

My office rent is Rs.45202 monthly. so Under RCM basis i have to pay GST for rent paid to URD. So my query is can i avail the ITC of the same in this july return itself or in August return. If i cannot take ITC in july return than should i manually have to add gst on rcm again in gstr2 july on sep10th or it will auto populate. And i can take the ITC in gstr3b return august sep20th right?