If.

Yes, if. You started to speculate here that it would not change a thing. The thing is, it would.
They aren't probably going to get this much but it would make a difference and I hope they will get it and push Russians outside their borders.
If Ukraine were to do enough damage to make them run back to Russia I'm sure it would make life easier for everybody, even the average Russian who goes to work and watches TV every day hoping for the war to finally end. Since Putin doesn't want to end it, somebody else has to end it for him.
I don't understand the reasons for this massive admiration of Ukrainians for Western weapons, it looks like a cargo cult. The F16 fighters are an approximate analogue of the MiG-29 fighters, of which Ukraine had noticeably more than the wildest expectations for the supply of F16, and most of them have already been spent. To prepare a pilot for F16 from scratch is a task for several years of training, it is possible to retrain with the MiG-29 in a few months, but does Ukraine even have so many horseless pilots? Recently, there were reports on the network about the pilot of the Armed Forces of Ukraine, Major Vladislav Savelyev, who died in early June, who studied in the United States for two years and died in the first sortie.
Russian air defense is initially tuned to larger objects such as aircraft. Therefore, it may have some difficulties with intercepting small drones, Himars missiles or low-flying Storm Shadow missiles, but Ukrainian aircraft are shot down with enviable regularity, and if this does not happen every day, it is only because Ukraine has few aircraft in principle.