One way to install: sudo pip3 install ps_mem
Running it gives you something like:
[cbrake@ceres ~]$ sudo ps_mem
Private + Shared = RAM used Program
96.0 KiB + 108.0 KiB = 204.0 KiB start_kdeinit
364.0 KiB + 434.0 KiB = 798.0 KiB lvmetad
368.0 KiB + 462.0 KiB = 830.0 KiB rtkit-daemon
664.0 KiB + 700.0 KiB = 1.3 MiB ksysguardd
...
216.4 MiB + 287.3 MiB = 503.7 MiB MainThread
305.5 MiB + 326.9 MiB = 632.4 MiB thunderbird
261.6 MiB + 393.8 MiB = 655.4 MiB Web Content (4)
307.1 MiB + 474.5 MiB = 781.6 MiB Discord (8)
304.2 MiB + 509.3 MiB = 813.5 MiB workflowy (9)
313.8 MiB + 522.2 MiB = 836.0 MiB electron (8)
425.1 MiB + 588.8 MiB = 1.0 GiB slack (7)
---------------------------------
8.2 GiB
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Thanks @khem for pointing out this tool!