Yes, MLR systems have been approved to be delivered. At the first stage, four MLRS will be delivered as a some sort of training devices for Ukrainian army. Maybe, in the coming month the first results will present themselves.
What's coming online now are the self propelled howitzers and GPS guided munitions. 40km, not 70km like the missiles, but they are deadly accurate. There are M109's in Ukraine from the US that aren't on any list. The ammunition is also compatible with the towed M777's that have the digital fire control computers.
None of that was there a month ago.
The recently announced MRLS:
4 ea. M142 HIMARS from the US. 4 ea. M270 from the UK. 4 ea. MARS II (improved M270) from Germany. Training and acquisition/sustainment for HIMARS was funded in the Lend-Lease bill. The USMC went to all HIMARS so there are 200 more M270's available in US inventory.
They all use the same missile pack. The M270 tracked launcher carry two packs of 6, the HIMARS wheeled launcher carries one pack. They all have self-loaders, so reloading is just changing the empty pack out for a full one.
Training on HIMARS takes one week (so they say, but that must be pretty rudimentary) and should be underway in Poland already. I know that the follow-on missiles for the MRLS systems will probably have to be pulled from Lockheed's production allocated to Poland and/or Australia. With all that, the first HIMARS should be deployable in June. (Germany's 4 pcs. will take longer than that...)
plus:
4 ea. MQ-1C Drones that can carry 4 ea, Hellfire or 8 ea. Stinger missile. Organic ELINT and ECM/EW capability, laser designator, and can geolocate any electronic emitter in it's area of regard. Kills tanks and helicopters and drones, ID's targets and can stay aloft for ~30 hours. Not confirmed, but it was written specifically into the bill so it should not be a problem in the Congress. These will take a little time to train the Ukrainian pilots and handlers, but not months if they already know how to fly TB2's.
The other eastern European countries take years, even decades to switch over to NATO standard- we're trying to do this in Ukraine practically overnite.
Everything is different, and the whole thing is a logistical nightmare.
I think people in the west are seeing what the delays have meant for Ukraine, and there is a doubling down on the effort. Ukraine's success in March made some people complacent (and others frightened).