The total combat losses of the enemy from 24.02.22 to 13.10.24 approximately amounted to:
personnel – about 668930 (+1300) people
Tanks – 8971 (+9) units
armored combat vehicles – 17876 (+49) units
Artillery systems – 19410 (+29) units
MLRS – 1231 (+1) units
air defense – 978 (+2) from
aircraft – 369 (+0) units
helicopters – 329 (+0) units
Operative-Tactical level UAV – 16992 (+45)
Cruise missiles – 2619 (+0)
Ships /boats – 28 (+0) units
submarines – 1 (+0) units
motor vehicles and tank trucks – 26584 (+71) units
special equipment – 3435 (+1)
To answer your question, the chart shows it to be ~6,120 total artillery systems left. At a loss of 50 a day (assuming they don't tailor down their use as they lose availability [massive assumption]), they should completely run out in about 122 days / 4 months (~ February 2025).
Obviously, that is unlikely to happen and I expect that they will tailor down their use closer to their production rate (I don't know what their production rate is) before the end of the year, as they completely run out of any reserves.