The plan is for me to climb into the dumbwaiter with my phone and a flashlight. Nick will then lower me into 11A. As soon as I’m out, he’ll raise it back to 12A, just in case Leslie keeps tabs on this kind of thing
It's "keep tabs on (something/someone)". w=keep+tabs+on&ls=a&loc=home_ac_keep+tab
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It's "keep tabs on (something/someone)".
https://www.onelook.com/?w=keep+tabs+on&ls=a&loc=home_ac_keep+tab