Haha, this is my second endorsement here for them (these love-fest threads seem to pop up every year or two):
Where I live, I get delivery within 24 hours, i.e. the next day with certainty or even typically the same day if I order early morning.
Their web-site is even more impressive. Everything is SO clean, clear, easy to sort through and yet so comprehensive, with drawings, specs and even CAD models provided. It's the polar opposite of Amazon's utter dumpster fire.
You do have to accept and trust their product curation (that took me a little while), and their prices might be a little higher, but so be it, McMaster is my go-to if they have what I'm looking for.
As a kid, my projects had to make do with whatever bent nails and scrap wood I could scrounge, and now practically every raw material and mechanical component known to man is available to me, including in hobbyist-friendly dimensions, all perfectly organized and documented, delivered the next day for a fair price with the mere push of a button. Is it a golden age for us? Feels like it!