Surfing from your phone with 10mb up should be ok for normal browsing, and probably basic video, but not anything too heavy like 4k video. 40mb would be a bit b

Surfing from your phone with 10mb up should be ok for normal browsing, and probably basic video, but not anything too heavy like 4k video. 40mb would be a bit better but still iffy for 4k... as for Time Machine, that's from your laptop to the house, so it's more your download bandwidth from your house that's important. Might be ok for smaller jobs but not major uploads.