From 1954 to 1975, theoretical physics created the standard model of particle physics. Experimental verification of the theory continued through 1980s and 1990s, and finally the Higgs boson in 2011.
But if we follow the dictionary definition of scientific theory "A coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed" or "a hypothesis confirmed by observation, experiment etc.", then after the 1970s, theoretical physics about the fundamental building block of reality hasn't really been theoretical physics, but rather hypothetical physics. They have worked on lots of theories (or rather: hypotheses) that they have not been able to test and verify experimentally.
But if we follow the dictionary definition of scientific theory "A coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed" or "a hypothesis confirmed by observation, experiment etc.", then after the 1970s, theoretical physics about the fundamental building block of reality hasn't really been theoretical physics, but rather hypothetical physics. They have worked on lots of theories (or rather: hypotheses) that they have not been able to test and verify experimentally.