Can humans acquire 'infinite' joy when they are finite beings?

I read CS Lewis say that the Beatification is an "infinite good" and, hence, "infinitely outweighs the negations" (the stuff we shall leave behind here). He also argued, in Letters to Malcolm, that we shall not experience time as an infinite present because we are finite creatures and, therefore, can only experience what suits our humanity. Being that we are finite, does that mean when he (or other writers) talk of 'infinite joy' they mean it metaphorically rather than literally? In Weight of Glory, Lewis also refers to it as 'transfinite'.