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An advanced LIGO and Virgo's third observing run brought another binaryneutron star merger (BNS) and the first neutron-star black hole mergers. Whileno confirmed kilonovae were identified in conjunction with any of these events,continued improvements of analyses surrounding GW170817 allow us to projectconstraints on the Hubble Constant ($H_0$), the Galactic enrichment from$r$-process nucleosynthesis, and ultra-dense matter possible from forthcomingevents. Here, we describe the expected constraints based on the latest expectedevent rates from the international gravitational-wave network (IGWN) andanalyses of GW170817. We show the expected detection rate of gravitationalwaves and their counterparts, as well as how sensitive potential constraintsare to the observed numbers of counterparts. We intend this analysis as supportfor the community when creating scientifically driven electromagnetic follow-upproposals. During the next observing run O4, we predict an annual detectionrate of electromagnetic counterparts from BNS of $0.43^{+0.58}_{-0.26}$($1.97^{+2.68}_{-1.2}$) for the Zwicky Transient Facility (Rubin Observatory).

Updated observing scenarios and multi-messenger implications for the International Gravitational-wave Network's O4 and O5