Betting that they are going to frac both laterals at the same time - going from lateral to lateral and back again as they do each perf / frac / set plug stage.
Very efficient approach
FYI - there are no plugs in the casing pre-frac / once the casing is set to TD in each lateral, that pape is “open” with no plugs. There may be some sort of scraper run to clean out any cement that may be in the casing. But no plugs.
The plugs are set after each frac stage. They can be drilled out or them may be the type of plugs that are designed to dissolve after “x” time so as to avoid having to drill out said plugs