I did a quick forum review to get a basic timeline we can expect for Wireguard support.
Going by OpenVPN:
In 2004 the first forum request was made for OpenVPN support.
With release 3.0 came the partial implementation there is today, which was around 2007.
The first Wireguard request was around Jun 11, 2017
This would mean that Mikrotik will probably release initial support around 2020