At this point on the curve (and I don't know where it's heading), the situation in Iran develops so fast and the communications blackout is so severe that information cannot be verified until it's already boring, and everyone trying to predict the outcome is working with unverified information.
Things that might be true, but are unverified:
-
the current protest wave has already grown bigger than the protest about Mahsa Amini's death, and repressions have grown more severe
-
reports exist of several hundred dead and several thousand wounded, hospitals reporting of an overwhelming number of injury patients and of mobilizing every resource they can to treat people
-
videos of protesters taking down the Islamic Republic's symbols in various places (I've been unable to geolocate them, I bet journalists are currently trying)
-
reports of police defecting in rural minority populated areas (e.g. where people are 75% Kurdish)
-
reports of police and Basij getting driven out of appreciable regions in large cities, and some of their stations getting torched
-
reports of the IRGC (revolutionary guard corps, military with above average loyalty to the regime) being deployed with live ammunition
However, I have seen few videos with good enough context (for a foreigner to understand and analyze) in a daytime setting. All the fighting seems to be occurring at night. What I have not yet seen is an armored vehicle being deployed either against protesters or by them. I have not yet seen machinegun or rocket grenade fire. So I believe that the IRGC is not on the streets yet.
They're pretty much the final tool that the regime can throw. A very deadly tool, however.
If the IRGC refuse, it's over and protesters have won - then the pains of reassembling a new Iran will start.
If they obey, blood will flow in streams and protest may still be crushed (or prevail over them, if protesters have managed to arm themselves or receive the defection of military units, or receive the support of underground militant organizations, among which the notorius Mujahidin al-Khalq would be a likely candidate and Kurdish separatists might take armed action in their home provinces). I personally think that lots of work is being done to convince some units of the standing army to defect.