I think that the current phase of the operation will continue for another 3-4 weeks and will end with the complete defeat of the Armed Forces of Ukraine in the Donbass. May 9, the day of victory over Nazi Germany in World War II, is a very important holiday for Russia, and the plans of the General Staff are probably synchronized with this date in order to provide the Russian people with sufficient evidence of the success of the operation, for example, the complete liberation of Donbass. The further course of events will depend on many circumstances, Russia has a multi-way and very flexible strategy. I estimate the probability of concluding a peace agreement between Ukraine and Russia during April as very low, close to zero.
I am sure that Russia will try their best until May 9th and they will try to win it at that time as well. The "story" or the narrative in Russia is that Ukraine is ruled by bunch of brand new nazis, you will see that in pro-russian publications it is always about how Ukraine has a lot of neo-nazis (which could be true and wouldn't change a thing) so they should invade. And nobody stops and thinks that you could instead help Ukraine get rid of these neo-nazis, instead of attacking them. Ukraine is not in love with their own hated groups, they hate them too, plenty of Ukrainian friends who got here after the war says the same, but instead Russia used that as an excuse for war. This can't make them go for too long when in the end they will realize you can't beat a whole nation, you can beat their army, but not a nation, eventually they will have to back off.