I'm just doing some napkin math here.Upto 100 1500kg bombs per day plus artillery.
Up to 100 x 1500kg = up to 150,000kg a day.
= up to 4,500,000kg a month (4.5Kt).
= up to 13,500,000kg (13.5Kt) since things really kicked off at the end of last year.
For reference the atomic bomb dropped on Hiroshima only had a 15,000,000kg (15Kt) warhead. Now of course one big bomb is going to do more than lots of little bombs, but it puts into perspective how hard Russia were hitting this city.