The sync feature is not available in Lightroom for the cloud. That feature is only available in Lightroom Classic. You can try to copy/paste and see if that will apply the adjustments that you are looking for, but you will have to paste to one image at a time. One copy procedure can be pasted multiple times. But that is the best you can do in Lightroom for the cloud.
I'm just another Lightroom user, no connection with Adobe, don't know any of the plans for the future. Even if I did I would be under obligation not to disclose them. Adobe does not make future plans available to anyone. You will know what is available when it becomes available. That's just the way it is.