It isn't completely finished - hence the six day closure and long period of 40mph running
mostly this is to accomodate a full closure of FRB til November, so they can deal with existing patchwork repairs and ostensibly amend approach roads for public transport dominance, etc etc
no change for cyclists thereafter however, who will continue to duke it out on the "cycleway" with bridge contractors, vans and their building site infrastructure, for years to come
this is because they are constructing a new caged walkway underneath FRB, on both sides, simultaneously (for bridge staff not public)
they are perhaps 25% done on that lengthy endeavour