Brock Lesnar is not currently being advertised for the WWE Payback PPV on April 30 in San Jose. On the website for the venue, Lesnar is not listed.
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Lesnar is also not currently being advertised for any Raws for the month of April. Obviously that could mean nothing or plans could change, but it seems like there is a possibility that WWE will not use Lesnar until after the Payback PPV at the earliest. His WWE contract only requires a certain amount of appearances and WWE has usually tried to ration those out in previous years.
Braun Strowman vs. Roman Reigns is the probable main event for Payback, since Strowman said on Raw that he would be coming for Lesnar after he’s “through” with Roman Reigns. The rumored main event for WrestleMania 34 is Lesnar vs. Reigns, but that doesn’t necessarily mean that they won’t face each other until then, or that Lesnar will hold the title for a full year.