It still remains to be seen exactly how big it is. My feel is it’s slightly smaller than Mount Pinatubo in 1991 (in my lifetime) which significantly reduced global temperatures for a bit. Folks have suggested maybe 0.1 to 0.5C (0.2 to 1 degree F) temporary temperature reduction.

Probably 4-6 on the VEI scale. https://en.m.wikipedia.org/wiki/Volcanic_Explosivity_Index