My plan is to release 3.0 for both iOS and Mac toward the end of the year, after Apple releases the new versions of macOS and iOS.
Brushing is planned for 3.0. I have been posting progress on Twitter recently. Here are links to those tweets:
https://twitter.com/gentcoders/status/1103405842437554176
https://twitter.com/gentcoders/status/1103407220811751424
https://twitter.com/gentcoders/status/1105204760930443272
If you use twitter, you may want to follow @gentcoders as I plan to post other progress as well.