I think the fronts are about to go, not quite gone though.
Any issues with them? Like noise or punctures? If not, then you can probably run for 4-5K km more.
Replacement of all 4 recommended. Conti CC6, Yoko GT AE51, Dunlop Veuro 303, all are good. Get any which are cost effective and from right source. 21 manufacturing is preferable.