Back in January developer AgileBits dropped 1Password 5.2 on the app store, bringing Time-Based One-Time Passwords (TOTP) under its roof, potentially eliminating the need for an additional password manager (Authy for example) so long as your comfortable with the distinction between TOTP and Two-Factor Authentication (2FA) which I am (AgileBits can help you with your decision here).
Finding the new TOTP option in the iOS app is easy enough, as there's a new and rather obvious "Add new one-time password" section added when editing a login. The tricky part is scanning the QR code provided by your online account, as the app simply switches into a scanner with no way to access the QR code that we'll assume is sitting in Safari or 1Browser. Thus, the process, best I can tell, requires two devices, one with the QR code visible, and one with 1Password and the QR code scanner open, which is as janky as it sounds, but mitigated by the ability to simply enter in an optional secret code.
Enter 1Password 5.3 for the Mac. Here the initial setup is less obvious, as there unhelpfully isn't a dedicated section for TOTP as with the iOS app, instead you click on the ellipsis options for a new section, then click "One-Time Password". From here things are much easier as the QR code scanner is movable, separate from the app, and sits on the top layer of your desktop, making it easy to slide 1Password out of the way and position the scanner over the QR code likely sitting in your browser. Thus positioned, the scanner automatically takes the scan, and just like that - 1Password begins churning out time-sensitive OTP's.
Bottom line: love the addition of TOTP to both platforms, but if you're thinking about converting more than just one online account over to 2FA, you'll probably want to do it on the Mac.