If these were shipped with how they would be outfitted in the US military, then it would be somewhat similar in capability to Ukraine's pre-war arty. In that best case it would still not be as good as having the pre-war army spawn back and would probably be used to take pot shots at Russians just as usual. However it seems that just like the M777, they will be shipped in gimped by the looks of things...What happens if they are given these weapons and Russia escalates and beats the sh1t out of them ? do they send F35s ?
Certain advanced munitions fired by the MLRS can reach up to 190 miles, but “no long-range strike weapons are being considered” as part of the package, one administration official cautioned. Instead, the U.S. is weighing supplying rockets that can travel roughly between 20 to 45 miles, further than the shells fired by the M777 howitzers sent to Ukraine in May, which can reach about 15 miles.
So If I were to make an educated guess if things are going how they are going now, then it is just the same old usual stuff, we will just continue to see artillery grinding and other attritional and positional type of fighting. One side having overall less men committed to the war yet more firepower fighting against the otherside with more manpower but lacking in fires and now mechanization. If artillery continues to be trickled in like this on the Ukrainian side, it will always be outmatched and have to resort to more asymmetrical tactics just as what we've seen with their tochka, MLRS, and SPGs which was especially prevalent early on in the war when they still had significant numbers. This isn't to say that it still isn't happening but it is just being done with far less than what those Ukrainian mechanized units would have on paper due to attrition.
Perhaps with more aid throughout the summer and fall, there can be more mechanized units formed in western Ukraine, I am thinking that if such a condition is fulfilled, then attempts at seizing Kherson alongside with the Crimean Canal could be attempted. However this thought is just something that could be plausible if western aid is enough to start arming whole units with vehicles and fires aside from those being fed into Donbass. Additionally in a few months we don't know how the war will go in the east or how things will be internationally.