I think they will have it on P18 first, then start making frigates and all with the same radar.
It's like how the P15A Kolkata class was the first to field the MF-STAR/Barak-8/

combo, later there was P15B, P17A Nilgiri, most likely P17B also, and from the screengrab we know NGC will also have the same package.
I'd assume before they put this on P18 for realsies, one of the older ships will be MLUd with a smaller version of this radar for field-testing, like how VLSRSAM is on a certain Rajput class destroyer, or that one Imported Spanish radar was fitted on INS Mysore first before being standard on P17A Nilgiris