Even prior to the arrival of HIMARS, the decimation of Russian armour was astounding. And that was with weapons NATO infantry teams, the least specialist, most numerous bread and butter soldier force, are all trained on and supplied with.
As it stands; the Ukranians are better fed, equipped, supplied, intelligenced (!), and have the ability to rotate in and out of theatre to keep up momentum. As the offensive continues, their armaments increase in both quantity (captured russian equipment) and efficacy (NATO finally testing their weapons against that which they've theorised about fighting for the past 50 years). With every passing month, cadres of soldiers pass out from NATO training in the UK and throughout the EU.
Prediction - with that in mind - the Russians won't wait 2-3 months to deploy conscripts. They'll start loading trains this week.
It's going to be horrific. The metaphor of Russian gloves coming off will prove to be nothing but allowing them to shove greater quantities of meat into the grinder.