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Yep, Google Maps (and if I recall even Apple Maps) will route you through the transit system just fine. Those of us who can’t read Japanese might need to pattern match on Kanji for station names (maps app will show both original and romanized names) but I don’t think that’s too much of a challenge.

Suica is great with how you can reload it from your US credit card, and works in many places besides just transit stations. It saved me several ATM runs last time I was there.

Google Maps + Suica worked wonders in 2019!

If you don't have good or any phone service, organicmaps works well.